Tracks disappeared in Cubase 14 pro

I have been using Cubase for many years, I am always happy with new versions, because it always gives more new opportunities, and it just becomes more convenient.

Yesterday I downloaded a trial version of Cubase 14 to get acquainted. Everything was great, new features, in general, great. Having worked in the new version with my new project and I closed it with satisfaction, I think to continue working in the morning.

But in the morning a very unpleasant surprise awaited me - when I opened the project I discovered that 12 tracks, on which part of the drum part was located, had disappeared. To say that I am discouraged and surprised is to say nothing. I do not know if this is a bug or just an unfortunate coincidence, but I admit that now I am afraid to continue working in version 14.

PS I closed the project, opened it in version 13, and the tracks were still missing. Then I opened the project again in version 14, and the tracks appeared again. A very strange bug.

Perhaps you are accidentally engaging the Track Visibility Agents.

I made a project in Cubase 12 and then I opened it in Cubase 14 and made sime edits, then saved it. All was fine until I opened it again after that in Cubase 12. All sampler tracks disappeared! If now I saved the project in Cubase 12 all this sampler tracks are gone forever!
Thanks God I had a backup project which was not saved in Cubase 12 after editing in Cubase 14. This is serious bug, it needs to be addressed