I found some time while waiting for the login queue for the realm I play on in WoW, so backported it already and it is in unstable if you want to validate it (restart before testing).
If it works I can cherrypick it to stable:
sudo eopkg install https://mirrors.rit.edu/solus/packages/unstable/m/mutter/mutter-3.38.1-70-1-x86_64.eopkg