i will till you when the bug or glitch happen:
1.sometimes if you are throwing ender pearl you get inside the wall
2.sometimes when you are riding a mine cart and hitted by a wall you get inside the wall
3.sometimes when you are riding the boat and your body or exactly your head hit with a block or a wall of blocks then you get inside the wall
note:that is very bad bug and all the people know it
Linked issues
duplicates 1
Comments 2
Duplicate of MC-280
@Alex This is a known bug, and yes you suffocate unless the block is on the bottom half of the avatar.
That isn't a bug. Your head cannot occupy the same space as another block or you suffocate... much like real life⚠️