Avoid manual grouping issue when Ctrl-V a cell?

Questions
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1

If you try to add a cell into an existing group via Ctrl-C Ctrl-V, the original group breaks up in a non-reparable way (in the Manual grouping regime). The cells are neither grouped anymore nor ungrouped. An attempt to just group everything together produces a beep. Only deleting inserted cell helps.

Version 12.0.0.0 of Mathematica, but was present in previous versions as far as I remember.

See the picture before and after Ctrl-V

math-cells.png
math-cells.png1852Ɨ752 88.1 KB

2

Yes, acknowledged as a bug by WRI on July 30 (any new cell pasting into a CellGroup mangles the grouping). Currently, I deal with it by saving the notebook, closing, opening and then manually grouping.

3

Thank you for reporting, this is indeed annoying behavior. And it is good to know that WRI also considers this as a bug.