Sometimes when walking off a block the player can bridge a 1 block gap without jumping. Attached is a video. This is extremely hard to reproduce. I have only tested white wool, but I assume it works with all blocks that are the same size.
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Ezekiel
Duplicate of MC-2301 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.