Sorry, I'm not sure what you are saying? It is true that some hotkeys and settings will be lost when you go from a newer version back to an old version and then to newer again.

It also happens to me the weeks ago when I update and I have to reassign the hotkeys. But strangely it only happen on my notebook not my desktop pc. They both run on windows 10.

Your notebook likely has an old preferences file, so you see it only there.