Solved.
No error shown. No errors in log, even without filter. It just crashes, while opening the layout with the map, both in debug or release.
I solved it by opening the layout in 11.20 and even without touching it, by exiting the designer it asks to save the layout. After the layout is saved with the new version, works without problems.
The layout only have a map fragment, and a few labels.
Odd as I have several other layouts saved in previous versions, all without errors, and some of them have mapfragments also.
Nevertheless It is solved, thanks.