I was mining some obsidian blocks on my private single player world, when I suddenly glitched through the block underneath the obsidian as it broke.
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I believe it was some type of block lag. The instant the block broke I found myself deep in a pool of lava.
I think my feet ended up inside the block and it pushed my underground that same instant.
Duplicate of MC-138550
Did you fall through the obsidian before it had a chance to be replaced?