So whenever you are standing at the block of an open trap door if you close the trapdoor it makes you do the swimming effect.
This only applies when the trapdoor is one block directly above another solid block
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Arisa Bot
Thank you for your report!
We're tracking this issue as MC-147612, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, 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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This is a feature called crawling, been in the game for a while now