Well, not really a bug per se.
Cubase doesn’t seem to autosave as long as playback is on. This can lead to disasters.
For me I very often have the track rolling while getting ideas, singing cue vocals etc and more often than not stuff like moving a midi event or loading a vst instruments leads to a crash.
I often remember to save manually each time I change anything 'cause sooner or later the program WILL crash.
So this is a feature request to actually have the autosave SAVE a version of the song in the intervals it’s set to.