All repros below use [mediaInline]
Repro 1: fish get stuck directly above non-solid blocks
Make a 5x5x5 source water chamber with a stone floor.
Replace the center stone block with a non-solid-material block (sea lantern, glass, leaves, ice, etc.).
Spawn a cod on the center block.
Expected result
The fish swims around.
Observed result
The fish does not move.
[media]Repro 2: fish stop and spin in place when moving across non-solid blocks
Make a 5x5x5 source water chamber with a stone floor.
Replace the center stone block with a non-solid-material block (sea lantern, glass, leaves, ice, etc.).
Spawn a cod on one of the 8 stone blocks adjacent to the center block.
If the cod starts moving toward any space other than the spot above the center block, kill it an spawn a new one. The bug can only been seen if it tries to swim across the space directly above the non-solid block.
Expected result
The fish swims across the non-solid block and keeps going.
Observed result
The fish stops and spins in place above the non-solid block.
[media]Repro 3: fish get stuck when moving across non-full-height blocks in 1 block deep water
Make a 5x1x5 source water chamber with a stone floor.
Replace the center stone block with a non-full block (lower slab, mud).
Spawn a cod on the center block.
Expected result
The fish swims around.
Observed result
The fish begins to swim but stops at the edge of the block.
[media]Repro 4: fish stop and spin when moving upwards in water 2 blocks deep above mud (MCPE-162241)
Make a 5x2x5 source water chamber with a mud floor.
Spawn a cod on the center floor block.
Expected result
The fish swims around freely.
Observed result
When the fish tries to ascend from the first layer of water above the mud to the second layer of water, it stops and spins in place.
[media]Repro 5: drowned stop and spin when swimming upwards over sloped terrain towards a targeted entity
Make a large water chamber with an inclined floor in the middle.
Place blocks a line of blocks sideways across the chamber so that they leave 3-block high water above the inclined floor.
Spawn an iron golem on the upper side of the incline chamber. Restrain it so that it cannot move.
Spawn a drowned on the lower side of the chamber.
If the drowned reaches the golem, kill it and spawn a new one.
Expected result
The drowned moves to the iron golem and attacks it.
Observed result
The drowned sometimes gets stuck spinning when it tries to ascend the incline toward the golem.
[media]I was playing on my bedrock addition, and I came across two drowned. Having nothing better to do I jumped into the water to gain their attention and started hitting them with a stick (the only thing I had on me) and they started glitching. One was spinning around while the other was pushing it into the dirt. Both while trying to attack me.
Related issues
is duplicated by
BDS-8245
Sea life mob pathing is broken
BDS-15314
Fish spinning
MCPE-45922
Tropical Fish get stuck on stairs
MCPE-58605
Named tropical fish from 1.13 now doing endlessly on the floor of the aquarium.
MCPE-60210
Fish get stuck spinning on sea lamps
MCPE-60220
Aquatic Mob Path Finding
MCPE-60497
Bucket fish Bug
MCPE-64596
the drowned when they are swimming and approaching the player, they keep turning in a single block
MCPE-66062
Fish pathfinding AI freaks out when encountering glass
MCPE-66445
Fish spinning on the glass blocks below the water
MCPE-67600
Aquatic mobs swim in circles at the bottom of a tank
MCPE-68523
Fish not moving correctly
MCPE-70844
Fish Spinning on Sea Lanterns
MCPE-71025
Fish Unable to Swim Over Glass
MCPE-75589
Glitched Drowned
MCPE-80256
Salmon AI Doesn't Work Properly
MCPE-104654
Fish spinning on sea lantern's
MCPE-108865
Drowned Swimming in Circles
MCPE-113446
Drowned spinning when in a certain spot (it's legs clip though walls a bit)
MCPE-117027
Aquatic animals swim in circles at bottom of tank
MCPE-133772
the axolotls are circling
MCPE-139430
Fish Spinning on Sea Lanterns
MCPE-151259
Drowned is moving weirdly (Mob AI issue!)
MCPE-151982
Spinning zombies in 1.18.2
MCPE-152627
Spin salmon and cod in sea lantern
MCPE-157886
Dolphins and Turtles tend to spin around in circles for random periods of time
MCPE-159787
Mobs spinning like a record with sea grass and grass
MCPE-161958
Fish get stuck in Sea Lantern and Glowstone blocks.
MCPE-162283
drowned started to spin
MCPE-177081
Why the drowned SPIN!
MCPE-181086
Drowned spinning underwater
MCPE-183565
Drowned Whirling Bug
MCPE-186218
Fish reacting weirdly to glowstone
MCPE-201683
Drowned just keeps spinning
relates to
MCPE-190996
Vanilla fish, tadpoles and dolphins "collide" with any non-water block 1 block above their position
MCPE-127381
Axolotl sometimes spin when pathfinding on top of lily pads
MCPE-37229
Dolphins don't consistently jump out to breathe, so they always die after a few minutes
MCPE-162241
Fish and tadpoles still spin over mud
Attachments
Comments
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Did you have this bug occur multiple times? Or just this once?
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I can confirm this in the latest 1.14.30 on the windows 10 uwp version and iOS, going to upload a video from both.
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This bug seems similar to the issue in Java edition, MC-104631
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GoldenHelmet has noted an amplification in this and similar bugs in MCPE-45922 MCPE-60210 MCPE-58605 MCPE-60497
[Mod] Umija5895M
Reportedly happens for other aquatic mobs also.
GoldenHelmet
I reproduced this bug by setting up an underwater area where drowned would have to swim up from one block to another to chase me, and where fish would randomly swim over sea lanterns. Drowned do this fairly consistently when swimming up from one block to another. For the fish, I had to wait about 10-20 minutes before they got stuck spinning on sea lanterns because they do often swim over them just fine.
RERJAMRGC
It happens as well that some land mobs have the same problem walking from one block to another one that is higher. They just start spinning in circles. Sheep, horses, and cows all have that problem. I can confirm this for Xbox One.
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I noticed that the fish also spin on the glowstone blocks. (v1.14.41 PS4)
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I'm receiving this bug as well, on Windows 10.
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Happening in 1.16.1 as well
GoldenHelmet
Drowned swimming up a block and stuck in seagrass: https://youtu.be/_pKbvzlgJ1s
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I am surrounded by an ocean and my fish are all path finding to the sea lanterns and then endlessly spinning in circles
[media]
GoldenHelmet
A fix to related issue MCPE-127381 is reported for the 1.17.40.20 Beta. Can anyone test if that fix affects this issue?
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@GoldenHelmet Yeah, I tested it and confirm that it still occurs in version 1.17.40.20
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I want to add that this happens with all mobs/monsters whether they're vanilla or custom made ones.
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Still happens in Bedrock 1.9.5 on xbox. Axolotls also exhibit this behavior. Can’t use sea lamps to light up water as all fish just start spinning
Brian
I'm having this same issue with Tropical Fish spinning on Mud Blocks with Kelp on them. Removing the Kelp didn't seem to make the Tropical Fish stop spinning.
May also be happening to Tropical Fish on Mud Blocks without Kelp.
[media]
GoldenHelmet
This bug has the same cause as MCPE-37229, MCPE-131091, and MCPE-162241: when mobs swim, the position that they target for movement is offset in the -Y direction from the path that they have pre-generated. In other words, after they find a path through water they try to move a block below that path. The exact offset is difficult to determine; I think it is between 0.25 and 1.25 blocks.
This offset causes swimming mobs to stop moving and/or spin when the block below them is made of non-solid material and all of the 8 blocks around that block horizontally are made of solid-blocking material. The mob then "thinks" it cannot move horizontally. (Non-solid material blocks include things like sea lanterns, glass, leaves, mangrove roots, and even water itself; solid material blocks include anything made of dirt, iron, wood, stone, etc.)
[media]In light of this analysis, I do not know why swimmers are able to move when all of the blocks below them are solid. I guess that there is some nuance to block checks during pathfinding that partially overcomes this bug. However, they are not above to navigate through one-block-high water that goes up over a block. They always try to swim into the block below the water in that case.
[media]
Spinning above mud floors (MCPE-162241) has the same root cause (swim Y offset) but the behavior is slightly different because mud is a solid block so the stopping/spinning relates somehow to the mud collision box.
[media][media]
contains the test chamber shown in the videos above, and several other test setups that can be used to investigate this bug.
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With the use of mud blocks, still a present issue in tropical fish, cod, salmon, turtles, and puffer fish in 1.21 bedrock on realms.