Flying mode still acive underwater

Video with bug demonstration is below.

When you fly into the water flying mode is not switched into swimming mode. You can use rockets under water, movement is slow otherwise. In order to activate swim mode you must enter the water normaly or hit the blocks. In previous versions swim mode could be activated with CTRL.

https://www.youtube.com/watch?v=O7G36cm0NhE

 

Comparison with 1.13.1:

https://www.youtube.com/watch?v=T_p1pOE719I