The issue:
Lines are visible around blocks from a distance. Probably due to some floating-point rounding.
I attached some images which show the F3 screen with my computer specs. This started happening in snapshot 20w49a
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Does MC-1794 describe your issue?

I've tried changing all settings from lowest to highest. Nothing has changed and this did not happen till 20w49a. All other versions of minecraft don't render fine.
Nothing has changed and this did not happen till 20w49a. All other versions of minecraft don't render fine.
Thanks, that's the important part. Probably caused by some behind the scenes rendering changes then.

This was fixed for me in snapshot 21w03a