well, still no go in latest Opera-developer 108.0.5054.0-1 (using chromium 121.0.6156.3).

But on Arch in Chromium 122.0.6261.39-1 it seems to work.

So maybe when opera upgradest to at least this chromium version things will be ok (Hope so)

@l33t4opera

another workaround is to alt+F4, close opera and start it againg with "--start-maximized" option. This will restore all tabs and cancel fullscreen