FlatList.onEndReached partially broken

[rectified95]

Scenario:

1. Go to page FlatList onEndReached
2. Scroll to the bottom (by hand, or with the 'Test' button on that page.
3. Observe no change in the horizontal, grey bar above the list - it's supposed to contain the string onEndReached
4. Maximize the app window - observe the string appear.

My guess is this could be somehow related to another issue, which is that the last list element is only partially visible: #7556

[jonthysell]

Not sure if this is still a problem?

[jonthysell]

This no longer repros.