RecyclerView Vertical scroll bar is not visible in ViewPager

I have ViewPager with 2 tabs:

1. any content (visible tab)
2. list content in RecyclerView (I use WearableRecyclerView for WearOS project but I think it doesn't matter)

When I swipe to tab with RecyclerView i don't see scroll bar.

Both methods is not work for me:

• android:scrollbars="vertical"
• recyclerview.isVerticalScrollBarEnabled = true
• recyclerview.isScrollbarFadingEnabled = false

Has anyone had a similar problem with a RecyclerView Scroll Bar in a ViewPager?