The Bug:

Players' swimming animations are jittery for other players.

When a player swims, the swimming animation for themselves is very smooth, however, for other players. their swimming animation is notably jittery. Every other player animation, for example, the elytra gliding animation, is smooth for all clients, therefore one would expect players' swimming animations to be smooth for all players.

Steps to Reproduce:

1. Summon a large area of water by using the commands provided below.

   /fill ~1 ~ ~1 ~31 ~10 ~31 minecraft:glass

   /fill ~2 ~1 ~2 ~30 ~10 ~30 minecraft:water

2. Get two players and label them "Player A" and "Player B".
3. Get both players to enter the water.
4. Get "Player A" to begin swimming and constantly moving around and have "Player B" watch them.
5. Take note as to whether or not players' swimming animations are jittery for other players.

Observed Behavior:

Players' swimming animations are smooth for the person who's swimming but appear as jittery for other players.

Expected Behavior:

Players' swimming animations would be smooth for all players.