At some point, Tropical Fish, Salmon, and Cod simply stop moving and at best only spin around. This happens even if the player is nearby. The swimming animation however continues to play.
The video below shows how some of the salmons didn't move, but just spun around.
To reproduce
(from MC-208729)
Create a body of water of any size. I used a 8 x 8 x 5 box
Fill it with tropical fish (you want at least a couple schools, I did about 100 fish)
Wait. Some fish stop moving within a couple minutes. Within 6 or 7 minutes, most tropical fish will either be crowding into a corner or have stopped moving entirely. The larger fish seem to take longer, at least when densely packed together.
Linked issues
is duplicated by 5
MC-190477
Tropical fish freeze when touching the water surface
Resolved
MC-197768
fish and squid swimming in place
Resolved
MC-204259
Salmon randomly stop moving
Resolved
MC-208729
Fish AI is broken: fish freeze (mostly at whole number y-levels) and don't start moving until hit or reloaded
Resolved
MC-214367
Naturaly generated fish get frozen
Resolved
relates to 1
Attachments
Comments 18
Since my bug report was closed as a duplicate of this, could you update the description to include some if the information I provided in mine? Like reproduction steps
In 21w10a. If MC-212687 is going to be counted as a duplicate, could the title and description be updated to include Squids and Glow Squid? Because it applies to both of them as well.
And for both squids this only seems to happen when far away, if you get close to them they resume normal behavior, unlike the videos with the salmon and tropical fish
I summoned some in a pool of water and saw them spinning just like in your video. While watching them I noticed their general movement has changed. They float up and down to a greater degree, and they were constantly running into each other head first but not altering their path to go around the other fish.