[MC-134755] All short mobs drown just below the surface of water

How to reproduce

Go to the middle of an ocean (without islands or landing places nearby) or build a pool so mobs in it cannot escape this body of water.
Put short mobs that can drown in it (I don't have a precise hitbox height to tell, but tested mobs are baby cats/chicken/pig/wolf/ocelot/ and silverfish)
It looks like they are swimming, but if you look carefully, they are a bit darker (more obvious for baby wolves), which means they are "submerged" in water according to the game engine.
Wait for them to drown

Note: This does not depends on water depth, they will try to float to the surface but still drowned just below the surface. It is not because they cannot swim, but they failed to float high enough to avoid drowning, which makes it an important distinction from another bug described below.

This bug should not be confused with MC-9388 Baby mobs cannot swim. I also originally thought that bug had reoccurred. However, there are several important distinctions:

It depends on the hitbox height, not whether the mob is a baby or not
- For example, some tall babies will not drown, such as baby polar bears
The baby do float, and seems to be swimming above the surface, but is actually considered submerged by the game

A list of affected mobs as of 19w11b (before the reopening of this bug) can be found in the comment https://bugs.mojang.com/browse/MC-134755?focusedCommentId=515912&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-515912
A list of affected mobs as of 1.14.3 (after the reopening of this bug) is:

BABY Foxes only
BABY cats only
Endermites
Silverfish

Pictures

1.12 (Expected behavior)

[media]

1.13 (Actual behavior)

[media]

Linked issues

is duplicated by 34

MC-133852 Puppies sometime drown in 1 bloc high water Resolved

MC-134635 Some baby mobs having swimming issues Resolved

MC-135748 Silverfish immediately begin suffocating when moving against a flowing water current Resolved

MC-136110 Baby wolfs drowned when they swim. Resolved

MC-136143 Extremely small mob babies (chicken, wolf, etc) drown whilst swimming in water. Resolved

29 more links

relates to 2

MC-142768 Mobs can suffocate below blocks, if the eye height isn't inside the collision box Resolved

MC-147853 Animals can not get out of water since 1.14-pre1 Resolved

Attachments

demo.mp4

Comments 31

Orbic 2018-11-01T02:49:21Z

Full grown cats and ocelots are doing this now too in the recent snapshot.

Jennie Ivins 2018-11-11T03:30:28Z

The only mob I can confirm is doing this now (in 18w45a) is the silverfish. This is only for adult mobs though. I haven't tested it with babies.

RobinDinVienna 2018-12-12T22:13:01Z

The cats still do this in 18w50a.

Would it be possible to add that version to the report?

Orbic 2019-01-10T03:21:01Z

Still happens in 19w02a, more specifically with cats which is very concerning considering they've been updated recently. (More people will be messing around with them)

Third Eye 2019-01-20T08:39:12Z

Baby chickens die when swimming in water in 19w03c, don't know if this is intended.

21 more comments

Sulnus 2019-01-20T11:06:42Z

Please add a list of all affected mobs, and whitch state they are in. Example: Mob: Dog, State: Young puppy

Orbic 2019-01-31T02:10:20Z

Full list of every affected mob

--Tested as of 19w11b. Note that a mob being tamed does not affect this.

ADULT and BABY Cats
BABY Chickens only
BABY Ocelots only
BABY Pigs only
BABY Wolves only
BABY Foxes only
Endermites
Silverfish

The problem appears to be that these smaller mobs can't keep their heads above the water. Their swimming positions seem to have been somehow altered. Both adults and baby Rabbits probably would be on this list but their swimming methods are an anomaly; their whole body bounces out of the water.

Jon1337 2019-02-13T19:11:57Z

Confirmed on 19w07a and affects Baby Foxes

Orbic 2019-02-21T05:29:32Z

Still in 19w08a

RobinDinVienna 2019-02-23T01:46:21Z

Also still in 19w08b. Tested with cats.

Orbic 2019-03-02T03:18:42Z

Still in 19w09a.

Keiya 2019-03-12T06:25:03Z

Can confirm in 19w09a, and this is total bullshit. I finally managed to find and tame 4 cats, and of them fully 3 managed to drown themselves.

Orbic 2019-03-13T20:30:44Z

Still in 19w11a. Perhaps the list I commented earlier should be added to the main report so it's clear about what mobs are affected.

Orbic 2019-03-14T16:40:39Z

Confirmed for 19w11b

Mitko1239 2019-03-14T18:20:33Z

Just happened to me in 19w11b as well

gaspoweredpick 2019-03-23T19:11:01Z

Still happens in 19w12b

gaspoweredpick 2019-03-31T07:38:41Z

Still happens in 19w13b

Kerry Wang 2019-04-06T22:33:31Z

All of my pet cats drowned. 19w14b

salias tee simon 2019-04-07T01:10:25Z

yep, still going on in 19w14b

Its frustrating. the pet doesnt even have a chance to try getting out of the however shallow water they have zipped into. youd think if they hated water, they would avoid jumping into it in the first place.

I had an adult cat drown in a single block of water before i could even reach it some 4 blocks away. It was right next to land too.

James Lai 2019-06-23T12:32:42Z

Could this issue be reopened? Baby cats drown again.
Test with version 1.14.3 Pre-Release 4.

[media]

Kevin He 2019-06-24T01:27:49Z

@hkniberg Can confirm that baby cats are still drowning even in the latest version (1.14.2 by time of this comment) This issue need to be re-opened.

Ben Finkel 2019-07-03T15:30:55Z

Confirmed for baby foxes in 1.14.3. This needs to be reopened, it's a big problem again!

pokechu22 2019-07-03T18:22:37Z

Reopened, since it sounds like all mobs are still affected. (If some mobs were fixed but others were not, please comment)

Kevin He 2019-07-04T01:25:12Z

@pokechu22 I put a list of affected mobs after the reopening of this bug (as of 1.14.3) in the description of this bug. The notable differences between the 2 lists (1.14.3 vs. 19w11b) are that the drowning issue for all (adult and baby) wolves, pigs, ocelots (not domestic), and chickens and adult domestic cats are fixed, BUT the issue of baby foxes and domestic cats are not fixed.