Color of TextView shows as white on a real device with ConstraintLayout

I have been trying my hands on ConstraintLayout and so far I have liked it a lot except now I have run into a peculiar problem. The same layout, if I design using a RelativeLayout displays the color of the contained TextViews as the default text color(greyish) but with ConstraintLayout, it shows white.

This happens on both a real device as well as an emulator with Android 5.0 but not on emulator(7.0). Does anyone know, why might this be happening?

Also, the obvious solution seems to be manually styling the color of the TextView in the layout to what it should be but that seems like a hack than a solution. I would be interested in knowing, why this is happening in the first place and if this hack is the only solution? (I prefer not fixing it by forcing a color on TextView as the behavior is correct on Android 7.0)

EDIT: Forgot to mention that the Layout Editor shows them both as black/greyish so that is also a cue that the actual color should not be white.

For your reference, here are the 2 layouts that are more or less same(there is a Button in one of them and TextView instead of Button in the other) in which one is faulty.

The layout that shows it white(issue in focus):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="4dp"
    android:layout_marginBottom="4dp"
    android:layout_marginLeft="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginEnd="8dp"
    android:background="@color/lightGrey">


    <android.support.constraint.ConstraintLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:paddingBottom="10dp"
        android:elevation="2dp"
        android:id="@+id/constraintLayout">


        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginLeft="16dp"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toLeftOf="@+id/guideline"
            android:layout_marginRight="8dp"
            android:layout_marginEnd="8dp"
            app:layout_constraintHorizontal_bias="0.0"
            android:id="@+id/linearLayout"
            tools:layout_editor_absoluteY="16dp">

            <TextView
                android:text="@string/tutor_name"
                android:textStyle="bold"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/tutor_name"/>

            <TextView
                android:text="@string/tutor_skill_set"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:id="@+id/skill_set"/>

            <TextView
                android:text="@string/tutor_types"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:id="@+id/tutor_types" />

            <TextView
                android:text="@string/tutor_location"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/location"
                android:layout_marginTop="12dp" />

        </LinearLayout>


        <ImageView
            android:id="@+id/display_pic"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_marginEnd="16dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="16dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="16dp"
            android:adjustViewBounds="false"
            android:scaleType="centerCrop"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintLeft_toLeftOf="@+id/guideline"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@android:color/holo_red_light" />

        <com.iarcuschin.simpleratingbar.SimpleRatingBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tutor_rating"
            android:layout_below="@+id/display_pic"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true"
            app:srb_starSize="13dp"
            app:srb_numberOfStars="5"
            app:srb_borderColor="@color/colorAccent"
            app:srb_fillColor="@color/colorPrimary"
            app:srb_starBorderWidth="1"
            app:srb_isIndicator="true"
            app:layout_constraintRight_toRightOf="@+id/display_pic"
            android:layout_marginTop="8dp"
            app:layout_constraintTop_toBottomOf="@+id/display_pic"
            android:layout_marginLeft="8dp"
            android:layout_marginStart="8dp"
            app:layout_constraintLeft_toLeftOf="@+id/guideline"
            app:layout_constraintHorizontal_bias="1.0" />

        <android.support.constraint.Guideline
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/guideline"
            android:orientation="vertical"
            app:layout_constraintGuide_percent="0.6796875" />


    </android.support.constraint.ConstraintLayout>


    <TextView
        android:id="@+id/tutor_requested_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="32dp"
        android:text="Requested time"
        android:textStyle="italic"
        android:layout_marginStart="32dp"
        android:layout_marginBottom="8dp"
        android:layout_below="@+id/constraintLayout" />


</RelativeLayout>

The layout that shows it black/greyish(default as it should be)

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:layout_marginStart="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginEnd="10dp"
    android:background="@color/lightGrey"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="10dp"
    android:elevation="2dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:paddingBottom="10dp"
        android:paddingEnd="10dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingStart="10dp"
        android:paddingTop="10dp">

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:weightSum="1"
            android:layout_toLeftOf="@+id/display_pic"
            android:layout_toStartOf="@+id/display_pic"
            android:layout_marginEnd="10dp"
            android:layout_marginRight="10dp"
            android:id="@+id/linearLayout2">

            <TextView
                android:text="@string/tutor_name"
                android:textStyle="bold"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/tutor_name"/>

            <TextView
                android:text="@string/tutor_skill_set"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:id="@+id/skill_set"/>

            <TextView
                android:text="@string/tutor_types"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:id="@+id/tutor_types" />

            <TextView
                android:text="@string/tutor_location"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/location"
                android:layout_marginTop="12dp" />

        </LinearLayout>


        <ImageView
            android:id="@+id/display_pic"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:adjustViewBounds="false"
            android:scaleType="centerCrop"
            app:srcCompat="@android:color/holo_red_light" />

        <com.iarcuschin.simpleratingbar.SimpleRatingBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tutor_rating"
            android:layout_below="@+id/display_pic"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true"
            app:srb_starSize="13dp"
            app:srb_numberOfStars="5"
            app:srb_borderColor="@color/colorAccent"
            app:srb_fillColor="@color/colorPrimary"
            app:srb_starBorderWidth="1"
            app:srb_isIndicator="true"
            android:layout_marginTop="2dp" />

        <Button
            android:id="@+id/request_tutor"
            style="@android:style/Widget.Button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/linearLayout2"
            android:layout_marginTop="14dp"
            android:background="@color/lighterGrey"
            android:minHeight="25dp"
            android:minWidth="80dp"
            android:text="Request"
            android:textAppearance="@style/TextAppearance.AppCompat" />

    </RelativeLayout>

</FrameLayout>

(Note: Although I tried using a Barrier below, it is in ConstraintLayout 1.1.0 beta and I would strictly refrain from using a beta version for production in this case)

EDIT 2: Following @rami-jemli 's advice, here is the ConstraintLayout with a barrier with the problem still persisting.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="4dp"
    android:layout_marginBottom="4dp"
    android:layout_marginLeft="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginEnd="8dp"
    android:background="@color/lightGrey"
    android:id="@+id/constraintLayout">


    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginLeft="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/guideline"
        android:layout_marginRight="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintHorizontal_bias="0.0"
        android:id="@+id/linearLayout">

        <TextView
            android:text="@string/tutor_name"
            android:textStyle="bold"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tutor_name"/>

        <TextView
            android:text="@string/tutor_skill_set"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:id="@+id/skill_set"/>

        <TextView
            android:text="@string/tutor_types"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:id="@+id/tutor_types" />

        <TextView
            android:text="@string/tutor_location"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/location"
            android:layout_marginTop="12dp" />

    </LinearLayout>


    <ImageView
        android:id="@+id/display_pic"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="16dp"
        android:adjustViewBounds="false"
        android:scaleType="centerCrop"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="@+id/guideline"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@android:color/holo_red_light" />

    <com.iarcuschin.simpleratingbar.SimpleRatingBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tutor_rating"
        android:layout_below="@+id/display_pic"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        app:srb_starSize="13dp"
        app:srb_numberOfStars="5"
        app:srb_borderColor="@color/colorAccent"
        app:srb_fillColor="@color/colorPrimary"
        app:srb_starBorderWidth="1"
        app:srb_isIndicator="true"
        app:layout_constraintRight_toRightOf="@+id/display_pic"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/display_pic"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintLeft_toLeftOf="@+id/guideline"
        app:layout_constraintHorizontal_bias="1.0" />

    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/guideline"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.6796875"
        tools:layout_editor_absoluteY="0dp"
        tools:layout_editor_absoluteX="250dp" />

    <TextView
        android:id="@+id/tutor_requested_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Requested time"
        android:textStyle="italic"
        android:layout_below="@+id/constraintLayout"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toTopOf="@+id/barrier"
        app:layout_constraintStart_toStartOf="@+id/linearLayout"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="8dp" />

    <android.support.constraint.Barrier
        android:id="@+id/barrier"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:barrierDirection="bottom"
        app:constraint_referenced_ids="tutor_rating,linearLayout"
        tools:layout_editor_absoluteY="126dp" />


</android.support.constraint.ConstraintLayout>

Output:(Dummy data)