Conversations involving multiple participants, allowing collaboration and information sharing in Teams
Must be the fault of a new Teams version for sure. I guess this was meant as an improvement, in some cases it even might be when you just want the text.
But most of the times I want the time stamps and person names copied for reference.
How about letting the user decide?
Right Click on highlighted area -> Copy message text only | Copy with time stamps
Ctrl+C -> Copy with time stamps
Ctrl+Shift+C -> Copy message text only
The workaround is not really workable, as already stated it copies a lot of clutter and combines lines of text which should not be combined.