Alright. I've actually might found the problem with at least one game. I am unable to copy this folder to any rclone mount (in Windows).
I tried manually, I can create New Folder, rename it to ad, and write some files to them. But when I'm trying to write this set of files, it fails. Sometimes with errors in log, sometimes not. But I never can read content of the folder.
I would prefer if someone will share config that works, because I've tried tens of them. I will make clean test this evening.