Same just happend to me with 15. I saved the mappings as global in 14, it worked fine for months and now got overwritten. (same happend several times before - so I don’t think the switch to 15 has something to do with it.) I tried to get it back opening an older Cubase 14 project, but it seems that file got overwritten. This is annyoing and should really be fixed!
Where do I find the needed pref file in my time machine?
Edit: Found it. Worked. Thank you!