The Bug:
The slowness and speed effects don't affect movement in water.
Steps to Reproduce:
Enter an open body of water, begin swimming in it, and take note of how fast you swim.
Give yourself speed by using the command provided below.
/effect give @s minecraft:speed 100 4 true
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.
Related issues
is duplicated by
Attachments
Comments


Confirmed.
is this because of the water slowing overriding the slowness effect?
This issue both applies to slowness and speed affects. When using a slowness effect the player will even speed up as soon as it's hitbox touches the water (Tested in snapshot 14w04b).

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.

Affects 1.15.2 and 20w20b.
Can confirm in 20w48a.
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a. Video attached.
Can confirm in 1.16.5 and 21w08b.
Can confirm in 21w17a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm in 1.18.1.
Can confirm in 1.18.2.
Can confirm in 1.19.
Can confirm in 1.19.2.

Can confirm in 23w31a.