I was in a cave, but randomly taking damage, when I realized jumping while on a horse with a solid block above your head suffocates you. I tried this multiple times and every time it suffocated me. The horse had diamond armor on so I am not sure if it took damage, but I don't think it did.
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Duplicate of MC-477, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.