Solved (apparently)
Restoring the drive did not help, but after many attempts of uninstalling and reinstalling MSFS from Windows Store and XBOX app (and also uninstalling the XBOX app), it finally installed from the XBOX app and then started from the XBOX app.
I had to reset some configurations which got lost, but for the rest not so tragic (luckily I did not have to reinstall all the game files, as they remained in the original location).
I think the culprit may have been a mandatory update which appeared today, and which I was not prompted to install until I uninstalled the simulator.
3 hours lost, and on the edge of a nervous breakdown…
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