Tango

When the menu comes up in the video and pause it, you are in a different place in the world, I think this is just a quirk of Discord streaming when your system is at 100% and unable to push frames to your viewers, it just fills in the gaps with the first frame of your stream. I think its a system performance issue rather than a MC bug. It seems like your CPU is struggling, a potential overheating issue or driver issue? Does Task Manager performance tab show anything near 100%?

Strange that it only occurs in full-screen, perhaps this puts the game in a turbo performance mode, therefore increasing temperatures? Or maybe your FPS is capped when you are in windowed mode and becomes less demanding on CPU/GPU? Or maybe a problematic overlay stops working in windowed mode?

Can you share more hardware information with us, are you on a desktop or laptop? What is your CPU and GPU? Are all drivers up to date? Are PC temperatures fine? What does your F3 debug menu look like in full-screen vs windowed mode?

Bug very much present in 1.21.9 RC-1 build. Its most notable with smaller entities like Bats, Mini Zombies, Phantoms etc. Issue has been around for more than few years now, feel that its gotten a lot worse in recent updates.

Tried 1.21.9 RC-1 build today, and sadly the issue is still there… 😥
I first noticed this issue 5 years ago around release of 1.16, also around time when Java 8 stopped being used. Really unfair bug for bow players, please fix it Mojang.