Android - app starts whenever Chrome starts - how is this possible?

I'm working on an Android app that has a strange behaviour - it starts itself whenever Chrome starts. And it doesn't matter what page Chrome opens. I'm trying to figure out how to stop this, but have no idea how this happens.

There is nothing unusual in the Manifest and no Broadcast listeners. Also I don't see anything unusual in the Chrome settings or any extensions. It happens on a number of phones but doesn't happen on others that have the same app version.

We even tried changing the applicationId - it still happens.

In logcat I can see only this line whenever this behaviour occurs:

I ActivityManager: Start proc 9360:com.company.appthatshouldntstart/u0a269 for activity: rah

This is the Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.company.app">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

    <application
        android:name=".ApplicationSpecifics"
        android:allowBackup="true"
        android:icon="@drawable/app_icon"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:excludeFromRecents="true">

        <activity
            android:name=".Activities.MainActivity"
            android:theme="@android:style/Theme.Translucent.NoTitleBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name=".ServiceSocket"
            android:exported="false" />
    </application>
</manifest>

I'm wondering what other ways exist to make an app behave like this.

Any help will be much appreciated!