Lever generates floating in the "Ice Box" structure in ancient cities

Please provide the world seed.

Seed – 9121424861806956400

Coordinates for the ancient city with the “ice box” from the screenshot – x-188 y-40 z1938

This happens because jigsaw pools include block processors which randomly change blocks. Ancient cities use them to create decay by replacing many of the deepslate and wool blocks with air and if there is a lever or candle or anything else on the block that is selected for removal it ends up floating.

While this is technically a bug, it is how jigsaw structures work in both versions of Minecraft and is more of an unfortunate side effect of the current implementation.

Wow, that is one great insight! Thank you.