Self explanatory. When in leaves, they suffocate you.
How to reproduce: Ride into leaves with a horse, or do something else to get your head inside of leaves.
Sorry if this bug report is not a very good one, it's my first one.
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Duplicate of MC-46765 - 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.