onLayout prop is missing x,y in callback's e.nativeEvent.layout

[fungilation]

I'm dropping in Tooltip as a replacement for my existing components, iterated as rows inside a listview over a data array. For example, a row:

<ToolTip onLayout={(e) => console.log(index, `Summary ${rowID} onLayout:`, e.nativeEvent.layout)}>
  <Text ...>
</ToolTip>

console logs would return for each row, e.nativeEvent.layout.width and .height as expected. .x and .y however always return 0, while TouchableHighlight returns the x,y coordinates of the rendered component as documented (React Native).

Is this a bug that e.nativeEvent.layout is not fully inherited from TouchableHighlight, or rather, the parent touchablewithoutfeedback?