A Bug or am I doing something wrong here?

This is a simple project demonstrating either a bug or my complete lack of understanding which, if the latter, I will retire into the hills of Saskatchewan, should I ever find one.

When presenting a screen modally inside a native Stack Navigator - on android - via presentationStyle: modal, everything works as one would expect. However, when I specify a headerLeft in the navigation options of the target screen, the title mysteriously disappears.

Build and run

This is an expo project, so...

1. clone
2. yarn
3. yarn start
4. hit a to launch and run on Android
5. Press f to pay your respects