I found a weird chunk error on Y layer 63. It is just a stone platform that I did not make. It is contained in just one chunk. It is only on one Y layer. It did not fill in generated terrain blocks or grass/flower (poppy). I found it in a swamp and ocean biome. They are NOT ghost blocks!
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Please provide the seed and coordinates.

If you have an affected world please zip it and upload it.

Resolving as duplicate. If you have the world we're still interested, though.
Duplicate of MC-126043