RT disappears somewhere if I switch from it to another program

No. In dev version there is some kind of huge color shift, although in the color management settings I also indicated the system profile and had already decided to manually indicate my own profile, which I created in displaycal.
Export settings - srgb. No variants.
There was no such problem in the regular version.

lucky, as a drowned man.

I had this problem in some version, older than 5.10, a few months ago. In short, I encountered the problem before. Then it disappeared somewhere when I downloaded rawtherapee again.