[MC-156980] Entities intermittently experience jittery movement when walking on boats

The Bug:

Entities intermittently experience jittery movement when walking on boats.

This also applies to some extent when moving on top of shulkers.

Steps to Reproduce:

Place several boats in some water and begin walking on top of them.
Observe how you sometimes start stuttering or jittering while moving on top of the boat.

Observed Behavior:

Entities intermittently experience jittery movement when walking on boats.

Expected Behavior:

Entities would not experience any jittery movement when walking on boats.

Linked issues

70 more links

relates to 7

MC-94168 Items fall into opening shulker Open

MC-254449 NoAI Shulker Peek tag can't register when summoned riding normal Armor Stands Open

MC-259856 Boats and rafts sometimes rapidly jitter when colliding with entities Open

MC-189645 Boats with players standing on them cannot be moved upwards by pistons Reopened

MC-274486 Boat slides off of another boat if they are located in different chunks when reloading them Reopened

2 more links

Attachments

debug-report-2019-07-25_11.18.26.zip

Comments 38

migrated 2019-07-17T15:38:16Z

Duplicate of MC-156979

migrated 2019-07-19T14:11:31Z

Duplicate of MC-136367

Makzevu 2019-07-20T06:39:32Z

Although the effects of MC-136367 can lead to MC-156980, players can simply jump onto a boat when one is in water at any time and still experience this issue, without the need to mount and dismount it (although that makes reproducing this easier).

Also, repeatedly jumping on a boat can buildup fall damage due to the bug.

Makzevu 2019-08-22T19:06:50Z

Confirmed for 19w34a.

Makzevu 2019-08-29T03:03:42Z

Confirmed for 19w35a.

28 more comments

Makzevu 2019-09-05T02:18:16Z

Confirmed for 19w36a.

Makzevu 2019-09-12T02:54:17Z

Confirmed for 19w37a.

Makzevu 2019-10-03T21:11:46Z

Confirmed for 19w40a.

Makzevu 2019-10-10T01:08:22Z

Confirmed for 19w41a.

Makzevu 2019-10-17T01:02:58Z

Confirmed for 19w42a.

Makzevu 2019-10-31T00:44:01Z

Confirmed for 19w44a.

migrated 2019-12-05T20:10:39Z

I really hope this bug gets removed until 1.15 release, it would be awesome to see a "fully working" release on the first try. Imagine the clean transition from 1.15 to 1.16 without any other release in between.

[Mod] violine1101 2019-12-05T20:12:28Z

Agreed, it would be nice if all bugs could be fixed until Tuesday. Unfortunately there's only a finite amount of time until then.

migrated 2019-12-09T23:35:36Z

At least you don't get killed by jumping out of the boat any more. Unfortunately this bug wasn't a part of that one...

Makzevu 2019-12-18T20:37:48Z

The stuttering effect only applies if the boat is not sinking. When spawning a boat and walking on it immediately, this bug doesn't trigger.

Relates to MCPE-59679.

migrated 2020-06-16T19:41:23Z

Confirmed still an issue in 1.16 pre7, note: This video was recorded in singleplayer.

[media]

SkytAsul 2020-07-18T21:08:43Z

Still an issue on 1.16.1. I'd love to see a fix ^^

Johnibur 2020-09-16T11:11:00Z

✔ Updated stuttering with boats: only happens when they are on water (https://discordapp.com/channels/647810384031645728/648555618994618378/754172816802316368)

Avoma 2021-01-27T13:36:26Z

Can confirm in 21w03a.

Avoma 2021-02-15T09:16:31Z

Can confirm in 21w06a.

Avoma 2021-03-29T18:40:30Z

Can confirm in 21w11a.

migrated 2021-06-08T18:02:40Z

Can confirm in 1.17.

Avoma 2021-09-01T12:17:39Z

Can confirm in 1.17.1.

Avoma 2022-06-07T16:22:00Z

Can confirm in 1.19. This issue now also can be seen with chest boats.

migrated 2023-04-30T02:57:12Z

Can confirm for 1.19.4.

Brevort 2023-09-07T15:05:32Z

Could we please remove the "on water" part of the title? There are multiple duplicates which say this happens even on land

PurPur134 2023-11-04T22:52:11Z

Is there a way to reliably reproduce this? I'm having trouble with this.

[Mod] Jingy 2023-11-04T23:08:51Z

I've noticed it's much more reliable to reproduce if you enter and exit the boat immediately after placing it down.

Ellivers 2023-12-19T01:45:58Z

I can reproduce in 1.20.4 and 23w51b.

This seems to be a client-server desync.
Here are consistent steps to reproduce:

Place a repeating command block with the following code in it:
tp @e[type=minecraft:boat,sort=nearest,limit=1] ~ ~.6 ~
Place a boat close to the command block.
Power the command block.
While the command block is powered, sit in the boat and get off.
You can now un-power the command block.
❌ Attempting to stand on the boat now causes stuttering movement. After a while, the client's boat position might be synced to the correct place.

In this example, you can notice that even while the command block is teleporting the boat every tick, you can row it away from the command block and it won't teleport back when you exit the boat.

Immodial 2024-04-20T19:50:14Z

Might relate to MC-247418; This seems to be due to the OnGround Player NBT not being set properly when clipped very slightly into a boat or shulker (probably due to floating point error), causing rubberbanding.

JUE13 2024-06-08T06:58:39Z

Affects 1.21 Pre-Release 4

migrated 2024-06-12T16:04:40Z

Can confirm for leashed boats that are floating midair in 1.21-rc1:

[media]

TheStegosaurus_ 2025-04-15T18:29:23Z

Can confirm for 25w16a. Still in the game

ampau 2025-07-26T08:04:31Z

Able to replicate in 1.21.8

FirHole 2026-05-21T08:06:29Z

Able to replicate in 1.21.11 (https://www.reddit.com/r/Minecraft/comments/1tgpe2f/how_can_i_get_rid_of_this_glitch_in_vanilla/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button )

mob 2026-06-10T22:11:35Z