https://bugs.winehq.org/show_bug.cgi?id=42989
--- Comment #2 from faalagorn@gmail.com --- Forgot to test that later, but indeed - adding a fate test with bronze rating *did* reset the version rating back to bronze. Thank you for suggestion Olivier F. R. Dierick!
The bug still exist, but at least there's a workaround that's working :) If it's hard to get fixed, it would be nice if someone could acknowledge it somewhere in wiki or notes as a known bug, so maintainers and admins can fix the wrong rating with fake test submissions that will be removed afterwards.