It kicks you cause of a movement packet bug basically the way to do it is to glide into water with an elytra and hold control and look up or maybe down and yeah
Linked issues
Comments 1
MC-125388
Elytra swimming looking up
Resolved
Duplicate
0
migrated
(Unassigned)
Unconfirmed
Minecraft 18w07a
Retrieved
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However, this issue has been closed as a Duplicate of MC-122354.
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