SUMMARY
Basically as the title says. I can't login into Wayland session, the screen goes black and nothing is happening.
But i can enter Wayland with newly created user.
My first thought was to bisect it by simply removing .local .config .cache see if it works and go from there but it didn't help at all. Then i took new users bashrc xinitrc and so on. When that didn't workout i simply copied everything(.local,.config,.bashrc,.xinitrc etc.) but baloo index files to this new user, changed ownership, and... he still could log in wayland session. Why?

It seems sddm wayland logging just don't work or doesn't catch it. 

Where else user specific data might be stored?

I could ofcourse create the new user and simply transfer all of my settings there but if this thing will keep on happening from time to time it won't be fun.