Active swimming animation overrides creative flying

This is really annoying when you're trying to build underwater in creative mode. You go into flying mode & you want to stay in place as you lay blocks until you chose to move, but every time you look up or down, you automatically swim in whatever direction the reticle is in.

The dolphins are also extremely annoying in creative mode because they bump you when you're trying to build.

If you go and pose on the seabed the player will stand up; then you will be able to use the "flying mode" again. Maybe this happens because the game detects you are underwater and sets you the "swimming mode".
 

Confirmed for 19w12a.

Confirmed for 1.14 Pre-Release 1.

Can confirm in 21w06a.