Teleport bug & Entity bug in PM 4.22

[MateusBlackyOFC]

Expected Result: The boss should leave the place and practice pvp with the player Actual Result: the entity stayed in its original place, invisible, hitting the player, and you could only kill the entity by hitting the place where it is spawned

videos demonstrating the bug: https://youtu.be/3nFj4tneAzU & https://youtu.be/xaBRuX-pDP4

This bug did not occur in api 4.21, but only in api 4.22 (MCPE 1.20)

Server version: 4.22.0 Compatible Minecraft version: 1.20.0 (protocol version: 589) PHP version: 8.1.19 PHP JIT: not supported Operating system: linux

[MateusBlackyOFC]

I only tested with the plugin that I believe has the problem Look at the boss bar, pay attention to this video please. Link: https://youtu.be/KAv6dywXf4c

[aabstractt]

I have the same issue and I produce it when launch a Pearl

[MateusBlackyOFC]

I have the same issue and I produce it when launch a Pearl

Note: I found out that my problem is teleport-related, so me and this guy have the same error.

[DaisukeDaisuke]

How to reproduce

• Join a server with two players
• Execute /tp ~ ~ ~ or use enderpearl on one of the players
• The teleported player's movement is not reflected and becomes rigid

[TheLemzz]

It's the same for me. After any teleportation, the player hangs (visually) in one place.

[Verciak]

It's the same for me.

[dktapps]

If you don't have any detail to add, please don't post "me too" comments, they just clutter the issue. You can vote for the issue by using the 👍🏻 reaction.

[dktapps]

This looks like the same issue as #4986 , which means the cause probably comes from #4394. This suggests that the issue probably existed prior to 1.20, but some change in 1.20 caused it to become a lot more prevalent.

[enchypl]

In the bedwars plugin after dying the entity stays at its spawn position put on the entities screen it's moving just fine it can hit others but others can't hit it . The entity is invisible to others this only happens when the other client is on the newly released 1.20 . I personally tried doing a roll back to 1.19 and the issue stopped. Hope this helps

[enchypl]

In the bedwars plugin after dying the entity stays at its spawn position put on the entities screen it's moving just fine it can hit others but others can't hit it . The entity is invisible to others this only happens when the other client is on the newly released 1.20 . I personally tried doing a roll back to 1.19 and the issue stopped. Hope this helps

The issue probably has happened before according to Minecraft bug forum this issue was reported in 1.17 and 1.19.41.

[dktapps]

Initial investigation reveals the following:

• The workaround for #4394 (despawning and respawning the entity during teleports) breaks the broadcasting of future non-teleport movements for reasons I'm not yet clear on.
• The original ender pearl issue in #4394 is still unfixed, so we still need a workaround for that.
• MoveActorAbsolutePacket::FLAG_TELEPORT doesn't work on mobs such as zombies, causing them to have movement interpolation during teleport.

Options: 1) Remove despawn/respawn hack (reintroduces #4394) a) Removing FLAG_TELEPORT solves #4394 , but causes every entity to have movement interpolation (visual glitch) b) Not removing it causes #4394 due to client-side race conditions 2) Use MovePlayerPacket to send out teleport movement updates (untested yet) 3) Rotate actor network runtime IDs during teleports. This has been confirmed to work by community developers, but is an ugly solution to the problem. However, this would break code one way or another: a) Changing the return of Entity->getId() would break plugins which use ID for array indexing and such, which is not an option b) Adding a second method Entity->getNetworkId() is a possible solution, but breaks all packet code which continues to use getId() in a non-obvious manner

There doesn't seem to be any good solution to this that covers all bases.