The bug
Standing inside a block or having a gravity enabled block fall on you triggers the elytra animation and pulls you down into suffocation.
How to reproduce
[media]Related issues
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This is also activated by being within a doorway when the door closes. No suffocation damage is taken in this case, but it looks strange visually.
TheBoy358
Fixed in 19w14b.
wobst.michael
Confirmed fixed in 19w14b.