I was going around my Creative world and found this. It is on a chunk border so I reckon it is a generation error. The world was generated in 1.16.4 and updated. I never loaded that chunk before though.
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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 non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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Please attach a screenshot with the debug screen up. That might help the mods to find the problem.