As for the effort to fix this:

If we deprecate this, there should be no new users of it in 3.11+.

If we deprecate and also fix this, and we happen to introduce bugs or behavior changes, then people that use it now will need to:
1) adapt to the new behavior
2) find a different way to do things (before 3.13)

If we deprecate but keep the buggy behavior it as it is, (1) is not needed. Less work for both us and the users.