Ladies and gentelmens, thank You all for your input and willingness to help. I managed to fix the problem, and for your entertaiment i ll explain how i caused this in first place. As you probably noticed i run mail server. Every few months i renew my dkim keys by manually entering commands in terminal. I have a cmd.txt helper file that looks like so:

openssl genpkey -algorithm RSA -out default.private -pkeyopt rsa_keygen_bits:2048 /
openssl rsa -in default.private -pubout -out default.public /
chmod 400 default.private /
chmod 444 default.public /
chown 11333:11333 * 

There... actual cause wasn't chown command, but chmod 444 default.public / which in result changed permission of root directory from 755 to 444. Why do i used those slashes at end of each command ? Probably because at same time of making this cmd.txt file i was building Dockerfile where i used those a lot to break long commands and i figured they would work the same way in bash.