You might see the following issues as a result of this change:

Manual testing of the Talkback and VoiceOver features
show that they still exhibit the same (correct)
behavior as before.

This change might have caused diffs in (previously passing)
golden tests since the SingleChildScrollView now nests both the
title and content widgets.
Some Flutter projects have taken to creating semantics tests
by taking goldens of semantics nodes used in Flutter’s debug build.

    Any semantics golden updates that reflect the scrolling
container addition are expected and these diffs should be safe to accept.

    Sample resulting Semantics tree:

If the dialog was already overflowing,
this change corrects the problem.
This layout change is expected.

    A nested SingleChildScrollView in AlertDialog.content
should work properly if left in the code,
but should be removed if unintended, since
it might cause confusion.

Code before migration:

AlertDialog