The update broke launching games for me and I have no idea what the cause might be. Steam launches fine, but when I click the "Play" button, games just won't launch further, i.e. no pop-up of a game client to log-in or update the client (it's a Unity game). A different offline game I launched from Lutris (also different prefix and different runner) ran just fine.
Same with games run from Lutris which are started totally different from Steam: runner is wine-ge-8-26 instead of Proton, different prefix, different variables. Disabling dxvk and d3d12 helps with starting, but then graphical blur occurs without a mouse pointer.
So I reverted to the last history step via sudo eopkg hs -t #
right before the update, everything works as expected for the moment.