The slowness and speed effects don't affect movement in water

The Bug:

The slowness and speed effects don't affect movement in water.

Steps to Reproduce:

1. Enter an open body of water, begin swimming in it, and take note of how fast you swim.
2. Give yourself speed by using the command provided below.

   /effect give @s minecraft:speed 100 4 true

3. Start swimming again, take note of how fast you swim, and compare this to when you were swimming without the speed effect.

Observed Behavior:

The slowness and speed effects don't affect movement in water.

Expected Behavior:

The slowness and speed effects would affect movement in water.