[MC-309562] Black spots in all my worlds

me and my brother both have this bug in all our worlds. the worlds have big black shadows that won't go away with torches or fullbright.

I dont know how to solve this, please help.

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친구 추가가 돼지 않는 상황입니다. 해결을 도와주세요.

Please do not report bugs occurring in a modded environment. Can you reproduce the bug in Vanilla?

Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

Any nonstandard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.
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If you have problems on large servers like Hypixel, please contact them first as they run modified server software.

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