There are some floating block over the floor.
Seed:8001572052155162247
Position:/execute in minecraft:overworld run tp @s -193.55 63.00 136.49 -5218.37 -13.71
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We're tracking this issue in MC-30607, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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That's how the WorldGen works. It can spawn Floating Islands on some seeds.