These are not handled from the list in https://matplotlib.org/stable/api/prev_api_changes/api_changes_3.5.0.html#miscellaneous-deprecations

- ``Collection.__init__`` previously ignored *transOffset* without *offsets* also
  being specified. In the future, *transOffset* will begin having an effect
  regardless of *offsets*. In the meantime, if you wish to set *transOffset*,
  call `.Collection.set_offset_transform` explicitly.

I do not follow.

That is #21550; it was never put into 3.6 or further.

- ``axisartist.clip_path`` is deprecated with no replacement.

Cannot find it.

It's lib/mpl_toolkits/axisartist/clip_path.py

Thanks! Sorted!

I think I may have messed up something when working on different computers. I am pretty sure that more than 1000 lines were removed earlier. But I have double-checked the comments and fixed those things again...