In first person mode, your view pauses for a brief moment at the surface of water before descending downward. This does not happen in third person. Attached video:
[media]In first person mode, your view pauses for a brief moment at the surface of water before descending downward. This does not happen in third person. Attached video:
[media]
I think I can see what you are describing, but I can also reproduce this (or something similar) in TPV if I press shift right at the apex when moving up out of the water, then there will be a short delay when moving under the water again. I think this is related to the fixes for players getting stuck in the sneak position. (See MCPE-38212 and MCPE-39970 also.)