[MC-140755] Fish have poor collision detection, causes "crowding"

I've made an aquarium and a couple ornamental ponds, and I've noticed that sooner or later, schools of fish get stuck near a wall. It seems that one fish fails to notice that it's pressed up against a solid block, and all the fish schooling with it just follow suit. Pufferfish are less prone to it since they don't school, but I've noticed one of them doing it at least once. Other aquatic mobs appear to be unaffected.

Linked issues

is duplicated by

MC-148996 Tropical fish AI bugs out, forcing them to stay in the corners of aquarium

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Comments

migrated 2019-04-24T20:06:43Z

I've noticed a similar problem. I made an open ocean aquarium with iron bars and we eventually all the fish are pressed against the bars, refusing to be dissuaded from their desired course.

Orbic 2020-03-14T02:32:52Z

Can confirm for 20w11a, may be the same bug as MC-148996

Orbic 2020-03-18T21:47:50Z

In 20w12a

Orbic 2020-06-10T18:03:28Z

In 1.16 Pre 3

Avoma 2021-01-01T16:45:27Z

Can confirm in 20w51a.

Orbic 2021-04-28T17:23:15Z

In 21w17a

Orbic 2021-05-05T19:55:32Z

In 21w18a

Orbic 2021-06-08T19:20:24Z

In 1.17

migrated 2021-12-13T01:06:35Z

In 1.18.1

migrated 2022-08-21T18:44:15Z

Still an issue as of 1.19.2 Bedrock

ampolive 2022-08-21T21:51:40Z

Bedrock Edition is a separate project. This is for Java Edition only.

wobst.michael 2022-09-13T16:23:55Z

Can this still be reproduced in 1.19.2?

migrated 2023-01-30T21:59:46Z

I'm still experiencing the same issue in 1.19.3 JE.

migrated 2023-04-21T19:53:23Z

I am seeing this issue in 1.19.4 Java

migrated 2023-06-22T14:34:14Z

happens in 1.20.1 Java, please fix

migrated 2023-07-17T20:52:57Z

I'm also having this issue in 1.20.1 Java

They all flock and stay in the corners of the pool

[media]

It's only the tropical fish who do this, the Cod fish I have swims around normally