Leaves, when walked into on a horse act like solid blocks and damage the player. This applies to all types of leaves. This screenshot shows the player dying on a horse to leaves.
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duplicates 1
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Sorry for posting a duplicate. I searched: leaves, suffocation, leaves suffocate, suffocate leaves. Thank you, and I will search more before I post a bug.
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.