Use case

Just use the Semantics widget with the header property.
Since the Flutter 3.38.0 update, TalkBack on Android no longer recognizes the header when only header: true is set.

This does not work on Android:

Semantics(
  header: true,
  child: Text(title),
),

This does work on Android:

Semantics(
  header: true,
  headingLevel: 1,
  child: Text(title),
),

On iOS, both variants are detected as a header by the screen reader.

Proposal

When you provide the header property in the Semantics widget, it should also work on Android.
It’s quite strange that it only works on iOS, while on Android I have to additionally use headingLevel for it to be recognized correctly.
This PR attempted to fix the issue but was closed:
#179681
Could you clarify why it was closed?