Is this a bug report?

Yes

Have you read the Bugs section of the How to Contribute guide?

Yes

Environment

1. react-native -v:
   react-native-cli: 2.0.1
   react-native: 0.47.1
2. node -v:
   v7.10.0
3. npm -v:
   v7.10.0
4. yarn --version:
   0.27.5

Then, specify:

• Target Platform: Android

• Development Operating System: Windows 10 Pro

• Build tools: Not using Xcode nor Android Studio to build native code. Have only tried this on Android.

• Comments: This worked fine with RN 0.44 until yesterday when I updated to RN 0.47 and I noticed that the sublists on my app stopped working.

Steps to Reproduce

(Write your steps here:)

1. Add a FlatList (vertical scroll) component with some data.
2. Have the renderItem prop be a function which returns another FlatList component (also with vertical scroll)
3. Let the nested FlatList have a constrained height

Expected Behavior

Both lists (parent and children) would be able to scroll (as it did with RN v0.44)

Actual Behavior

Only the parent FlatList scrolls.

Reproducible Demo

https://snack.expo.io/HJSueSfPZ