First of all: thank you all for your quick answers^^
Kuri; I don't think I'm using any of these mods, so that shouldn't be the Problem ...
BirdieBeep and Merthur; yeah thats the issue I have. (: Good to hear, it's already mentioned. I Hope there will be a solution soon, but Merthur what do you mean, by posting in the Bug Reports? Because. .. yes I've got that issue after the 1.17 Update. Should I make a Post there? I mean that Problem is already known, or am I understanding it wrong, that this issue ist only known for 1.16 Patch?
(: Again thank you all ^^