Multiline TextInput doesn't grow properly in React Native 0.47.1

A repro is stated in the facebook/react-native repo at this issue:

This began to occur when I updated to Expo 20 from 19. Presumably this is associated with the fact that Expo 20 relies on RN 0.47.0.

Is this issue fixed in Expo 21?

It looks like the commit which closed the issue you linked is a part of 0.48.3, which is used in SDK 21 (releasing some time next week), so you should have a fix available soon!