Scooping water in one block area doesn't remove water.

I'm not sure how you manage to swim in a 1x1 area. Could you attach a video?

I experienced this while digging upwards out of a cave and using water climbing to go upwards and then placing a block below me creating a 1x1 space.

Thank you for your report!
We're tracking this issue in MCPE-128607, so this ticket is being resolved and linked as a duplicate.

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Despite claiming to be resolved, in the current version (1.20.81) this is still an issue. You can swim in a 1x1 area by blocking yourself in while underwater.