"Thank goodness," I can hear some of you saying. BUT, I think the issue is resolved, at least to my satisfaction (and I'm not convinced anyone else uses Takes, anyway). Takes do work in MEP2021 and probably by extension in MEP2020, too - but the Edit menu item "Save Objects as Takes", which I've always employed up to now, results in only the video component of the clip being saved. The slightly more laborious method of saving Takes by dragging clips from the timeline to the media pool saves the full clip, audio and all. The "Save Objects as Takes" item in the Edit menu is fully functional in MEP2019 and possibly earlier versions also.
That's the last comment I'm going to make on this subject, honestly.
Richard