Weird, weird bug in Cubase 10.5x

[jancivil]

has occurred in every version of 10.5 here.
Background: I go back and forth with linear time and bars 'n beats/musical time, and there's a logical editor project preset to toggle this status. Primarily working with MIDI but if there's audio I've committed to it has to follow as well.
At times a (MIDI) track gets into a state where the status will not toggle, it's stuck at musical time; note that this is the PART/event that won't comply rather than the track, as my workaround is to cut the part, create a new track for it, and paste. And it tends to occur again with the part later. I don't know what's in the part to cause it, but this is always an Absynth track. Maybe coincidence, either way I don't know why it occurs. My adjustments in musical time are pretty small, and when I do it's all of MIDI tracks in a single Key Editor, so I have no logic to work from

Recently a consequent of this was, in between saving and closing (quitting Cubase or just closing project window, doesn't matter) Cubase has elongated the track (still exhibiting the stuck-as-though-locked status) to an insane extent.
The track was all told a minute, 25 seconds. Now I open the project and it looks at first glance like the track is empty but I notice the project length is hours long (NB: originally set to 2:30, the project is finally 1:32 and a couple frames total) because the track is radically extended in time. The obvious fix is "Resize by time-stretching", to drag the part back into roughly its correct length. But now not all of the part is intact. Again, it's not 1:25 turned into 3 minutes, but 1:25 into >4 hours.

I'd seen this before in C9 (although not to this extent) but I hadn't correlated it with the stuck time status.
I had to rebuild the part; then I exported a MIDI of the part. This particular manifestation ceased after that, importing the part. I don't know that this is causal, but I have not seen it since that day.

Has anybody seen either of these cases? I'm not expecting answers to this, but I wonder how specific to me this can be. I'm calling it a bug because it is not something I did and it's that consistent, different projects (new, then rebuild) established in all the troubleshooting. If there'd been a more involved part, or I was really married to the part as-is in this case I'd have lost a lot