If you destroy the final block model in a 16 3 chunk, it becomes a ghost block until you either add a block model back into the chunk or use F3
+ A
.
Block models are all blocks except chests, ender chests, signs, and barriers.
Steps to reproduce:
Fly into the air until you are at least 16 blocks above all terrain
Use the command
/setblock ~ ~ ~ stone
Break the stone block, notice it still renders
Press
F3
+A
, notice it disappears
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[media]

Dupe of MC-62166

Related to, but not the same, as it is very consistent, and only on the emptying of a chunk.