"The project could not be saved: the project is corrupted"

happened two times in two days. Out of the blue, I didn’t even try to save the project (must be the autosafe feature).
Saving the project to another folder and/or with another name doesn’t work either.
First time it happened I only had one instance of GA SE and two or three audio tracks with Steinberg-only plugins (channel strip); 2nd time same track count + dabbling with Crystal VSTi …

Dump files too large to attach … see here:

I left Cubase more than 10 years ago and just bought 11 Pro a couple of days ago to facilitate project exchange with other musicians and friends … Not the most robust impression. It already crashed several times on me.

Found other dump files, smaller:
Cubase 64bit 2020.11.18 (725 KB)
Cubase 64bit 2020.11.23 (678 KB)