Because of the sudden number of positive tests at Bayern, one may ask where it comes from. The FIFA Club World Cup would be one possibility.
But apart from that, they will not repeat their game like against Bielefeld. I expect Bayern to win.
I am 90% sure that it is from fifa club world cup, because they were fine before that and have been not so fine since that day, and considering other nations have a lot lax situation going on compared to germany (which didn't even allow a home game to played at home, so german teams played at neutral stadiums because of german restrictions) we could assume that they wouldn't get it inside germany, it would be very difficult, which menas it was out of germany. And the only games they played was against El Ahli and Tigres, which I assume could be the place where they got it.
Honestly even after a year of this, we are still seeing some people caring about it while others not really caring about whats going on and not being careful enough, that is really not acceptable, the whole world is in danger right now, millions of people are dead, making sure players are safe and away from danger is not really that difficult, why do some nations not care about it is beyond me.