Several times in the new snapshot I have fallen into the solid block below me. Unfortunately it seems to be pretty random so I wasn't able to recreate it yet, but it's fairly common. I have had it three or four times so far since I started playing the new snapshot yesterday. It has happened on both grass blocks and stone blocks, so it isn't something to do with the block type. Otherwise I have no idea why it is happening. Also sorry if this has already been reported, I'm sure it probably has but I tried searching for it and nothing came up.
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violine1101
migrated
My apologies, I went to recreate it and I realized that I think I mistook the automatic trigger of the crawling animation for falling into the block below me, since both would look the same in first person and I somehow never realized that crawling was even in the game. But the other person who commented seems to have had a different problem than what I thought I had so this could still be a problem.
Chandler
I believe that would make it a duplicate of MC-177970
If possible could you provide a short video demonstrating this issue?