Somehow Zero-k decided it is time to remove special effects and change everything to black boxes. I dont know what caused this bug as I was only spectating and didnt change anything. This happened after I spectated 3 other games in a row.
It seems to be a problem with the map Zed 2.3. as I didnt have this bug the next game on Inculta. Or somehow sth broke while watching, but the infolog is too big for spoiler and for pastebin i guess i cant upload it.
A collection of in game pictures I made can be found here https://imgur.com/a/7eYsrW4
Some where you can see the bug especially well are these: