So there is apparently new bug that has happened for me twice now.
When the match was about to start and I was in that menu, I couldn't choose anything other than just that spectators option.
I couldn't pick that class / loadout option and I couldn't select the team and that match wasn't even full yet.
I was only able to go back to the start menu or close the whole game.
Otherwise the game has worked pretty fine so far at least on my hardware.