When a player is falling and hits the side of the block, depending on the situation they can actually land on top of that block.
How to reproduce:
1. Place one block at least 2 blocks off the ground, then place another one block lower than the first with a two block gap in between.
2. Face about straight forward, and sprint directly off the block.
Or:
1. Place one block at least 2 blocks of the ground, then place another one block lower tan the first with a three block gap in between
2. Face about straight forward, then walk forward and jump at the last second
Note: This works without Auto-Jump turned on
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This appears to be a duplicate of MC-75022, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.
Please provide a screenshot of your game with the F3 debug screen enabled.