Since the last snapshot, player's point of view is inverted. I logged into my survival world and everything was uspide-down. I tried to load an other world that i played in 20w21a and it was also bugged. Then i tried creating a fresh new world and the issue was the same. Here's what it looks like (screenshot below).
Perhaps it has to do with the experimental graphic changes in this version.
I thought it could be fixed by setting a FOV with a negative value, but with default settings the game is currently unplayable.
My setup :
CPU : Intel Core i5-4440 4 cores 3.10GHz
GPU : GeForce GTX 770
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I just checked that a few minutes ago and it does

We do not have enough information to find the cause of this issue.
Please force a crash by pressing F3 + C
for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.
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Here's the crash report.
[media]Can you please check what happens when you spectate an enderman? I suspect that your issue might be that the shader "Flip" got activated somehow.

Please also update your video card driver, they are massively outdated: https://www.nvidia.co.uk/Download/driverResults.aspx/160004/en-uk
@violine1101 Here's what happens
[media][media]
Please check if updating the driver solves the issue.
I already checked yesterday and it's still the same
[media]I haven't experienced this bug, and I don't even have a graphics card, I use the built in graphics. Maybe it has something to do with the patch for transparent blocks being invisible when looked at through a transparent item, for me and some others, the patch causes lag, maybe for you it causes the screen to flip.

Friend reproduced this on a NVIDIA GeForce GTX 1060 6GB
Try deleting the shaders folder in that resource pack in path assets/minecraft
Won't work since i said i already tried with the default resource pack and the result was the same
THIS IS STILL AN ISSUE IN 1.16 pre 1, but only with the "fabulous" graphics. PLEASE REOPEN
Please check if this also occurs without any resource packs.