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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:

  1. Place several boats in some water and begin walking on top of them.

  2. 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

MC-274283 Sometimes when exiting a boat the player is unable to move outside of the boat's hitbox Resolved MC-273128 The boat's hitbox can glitch, so, you can be stuck in a block, or in a very buggy animation... Resolved MC-275110 Walking on floating boats while they are attached to a lead isn't smooth. Resolved MC-278701 walking on boats are broken Resolved MC-280193 Ejecting from a moving boat causes "Stickyness" while walking or running on the boat aterwards. Resolved

Attachments

Comments 34

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.

Confirmed for 19w34a.

Confirmed for 19w35a.

24 more comments

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.

Affects 1.21 Pre-Release 4

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

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Can confirm for 25w16a. Still in the game

Able to replicate in 1.21.8

Avoma

(Unassigned)

Confirmed

Platform

Normal

Collision

Minecraft 1.14.3, Minecraft 1.14.4 Pre-Release 5, Minecraft 1.14.4 Pre-Release 6, 1.14.4, 19w34a, ..., 1.21.5, 25w19a, 1.21.6, 1.21.7, 1.21.8

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