As composer wraps up its reply, it can hijack the text cursor away from your terminal, or wherever you were typing.
If you happen to be backspacing at the moment, the backspaces suddenly are focused on Composer change blocks… and start erasing entire blocks of Composer code!
Ctrl Z undoes these, but you have no clue how many blocks you accidentally erased, so it’s not clear when to stop Ctrl-Z’ing. It puts you into a very uncertain state of code as well.
Sudden focus switching has been a problem for me since I started using Cursor, very frustrating for me.