Minecraft won*t start after Experimental 1.20 has been changed to Full Version 1.20

Now every time the launcher is startetd, the green main "SPIELEN" (play) button says "Warten auf Installation" (wait for installation) and additionally is greyed out after being clicked. Nothing happens after that., the launcher is not in the freeze state. after 10 minutes, the game starts. Is there perhaps too much online traffic after the new release has been deployed? Am I the only one who sees this behaviour?