If you are on spectator mode, then you change into creative mode with a block in your head and a block of air below it, when you change you will be doing the swimming/crawling animation even tho you're flying
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SPGoding
Pepe20129
Thank you for your report!
However, this issue is a Duplicate of MC-147612.
That ticket has already been resolved, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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