8.5.20 - Undo/Edit MIDI disabled after recording

Sometimes, after I’m done recording on an instrument track, Undo will do nothing and the MIDI parts are untouchable. I can’t select them, can’t delete, can’t open to edit in the editor. I have to close Cubase and open again.

This only started happening once I updated to version 8.5.20. Anyone else having this issue?

hey seem this problem has happened earlier but nobody has bothered to rectify it
i am facing the same issue what did you do to get it rectified? my whole project is suffering becasue of this is there a solution to this?
mine is CUBASE 12 in fact because of this issue I updated Cubase but nothing happened.
do let me know if you have any solution to this thanks in advance.