[MC-44654] Some entities don't update position to the client when teleported

The bug

When you try to teleport certain entities using the @e selector, they do not move visually (i.e. client-side), but actually move server-side. You can then for example not hit or interact with the entity and must reload the world to see its real position and hit it again.

Affected entities

Area effect cloud (minecraft:area_effect_cloud)
Only when not changing size (?)
End crystal (minecraft:end_crystal)
Fishing bobber (minecraft:fishing_bobber)
Lightning bolt (minecraft:lightning_bolt)

How to reproduce

Enable F3+B

Run

/summon minecraft:area_effect_cloud ~ ~ ~ {Radius:0.5,Duration:9999}

Go some blocks away
Run
```
/teleport @e[type=minecraft:area_effect_cloud] ~ ~ ~
```
→ Notice that the Area Effect Cloud did not move
Close the world and re-enter it
→ Notice that the Area Effect Cloud now changed its position

Code analysis

Code analysis by @unknown can be found in this comment.

Linked issues

is duplicated by 19

MC-272837 End crystals sometimes don't render after traveling through end gateways Resolved

MC-222110 Fishing bobbers are not visually updated when teleporting Resolved

MC-219938 area effect clouds wont teleport Resolved

MC-163283 Invincible End crystal hitbox and tp issue/madness Resolved

MC-208362 particles do not update location when teleporting area effect cloud Resolved

14 more links

relates to 4

MC-256085 Teleporting a shulker with Peek manually set causes it to close visually but not behaviourally Open

MC-174912 End crystals don't render after being moved with pistons until the world is reloaded Open

MC-73719 Teleporting Ender Dragons with NoAI set to true won't update visual position Reopened

MC-267025 End crystal visual desync when being pushed by a piston at a high tick rate Resolved

Comments 25

kumasasa 2014-03-02T10:06:11Z

Confirmed.

Itouch2 2014-05-25T15:04:32Z

Confirmed for 14w21b.

marcono1234 2014-06-19T13:24:12Z

Duplicated by MC-49306

Confirmed for 14w25b

Kavukamari 2014-08-21T10:03:20Z

Confirmed in 14w33c as well, still broken

Kavukamari 2014-08-22T02:00:56Z

Sorry to double-post, but I just tried it in 14w34d as well, and the render glitch still happens there too

15 more comments

eL_T 2014-10-03T14:34:50Z

Same issue exist in 1.8.

Kavukamari 2014-11-29T03:44:09Z

Still a problem in 1.8.1, just tested it.

kumasasa 2015-11-27T07:34:32Z

Is this still an issue in the current Minecraft Snapshot 15w47c or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

FDB_hiroshima 2015-11-28T18:50:52Z

Not fixed as 15w47c

marcono1234 2016-06-20T14:50:09Z

Confirmed for

1.10

marcono1234 2016-06-20T14:57:10Z

Please link to this comment in the description

The following is based on a decompiled version of Minecraft 1.9 using MCP 9.24 beta.

The reason for this is that the tracker entry (net.minecraft.entity.EntityTrackerEntry.EntityTrackerEntry) uses for hanging entities (paintings, item frames and leash knots), EnderCrystals and AreaEffectClouds the maximum value of an Integer as an update frequency. The teleport command itself does not send a packet to the client, but instead the tracker does this if it detects a difference. As these entities are not updated as long as no value of their data manager is changed, no teleport packet will be sent to the client. The net.minecraft.entity.EntityHanging class solves this by setting the field net.minecraft.entity.Entity.isAirBorne to true when its position is changed. This way the entity tracker tests if the position changed.

SUPERNOOB20 2017-07-13T21:25:44Z

Confirmed for 1.12 :C

[Mod] Asteraoth 2018-08-01T18:32:35Z

Confirmed for 18w31a

[Mod] Asteraoth 2018-08-08T15:50:58Z

Confirmed for 18w32a

OnePointZero 2018-11-03T19:07:13Z

Confirmed for 18w44a

Sentropic 2019-09-11T03:55:05Z

Confirmed for 1.14.4 and 19w36a. I really hope this get fixed by 1.15. It's a very nasty one :/

Paul Hayes 2020-06-29T18:52:08Z

Just experienced this bug while messing with area effect clouds in 1.16.1. Something I found out that isn't really mentioned (At least for Area effect clouds) is that they're still technically there, which you can find out if you do "/execute as @e[type=area_effect_cloud at @s run summon armor_stand" and it will be at the area effect cloud's current location instead of the aec's visual location.

Paul Hayes 2020-06-29T21:26:18Z

Also, literally just found out that it also applies to Fishing Bobbers too.