Player#teleportAsync with RETAIN_VEHICLE does not work

[Boy0000]

Expected behavior

When teleporting a player with RETAIN_VEHICLE it should teleport the player with the vehicle

Observed/Actual behavior

When teleporting the player, it desyncs and does not teleport player or Minecart
As clip shows when then you dismount the vehicle, it moves the player to the given location, but vehicle is left behind
On dismount it also calls the PlayerTeleportEvent again as shown by console log
Removing the RETAIN_VEHICLE flag correctly teleports player, but leaves vehicle behind

Base.Profile.2024.10.18.-.11.02.31.05.mp4

Steps/models to reproduce

1. Listen to VehicleMoveEvent
2. Filter passengers to players and teleport to XYZ with RETAIN_VEHICLE flag

Plugin and Datapack List

[11:10:28 INFO]: Server Plugins (1):
[11:10:28 INFO]: Bukkit Plugins:
[11:10:28 INFO]:  - TeleportAsyncTest

Paper version

[11:10:17 INFO]: Checking version, please wait...
[11:10:17 INFO]: This server is running Paper version 1.21.1-123-master@aebbdc9 (2024-10-16T14:15:18Z) (Implementing API version 1.21.1-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.1-DEV-959e632 (MC: 1.21.1)

Other

Worldheight is extended to 512 via a datapack, hence the -480 on teleport-location

No response

[Boy0000]

Also affects teleporting Vehicle with RETAIN_PASSENGERS fairly consistently

Base.Profile.2024.10.18.-.11.02.31.05.mp4

Shows it consistently breaking one way until i move a second player into the target-location
Assuming to keep chunk loaded, thus teleport goes from breaking consitently to not breaking

Base.Profile.2024.10.26.-.13.55.19.07.mp4

[Boy0000]

After adding a getChunkAsync before the teleportAsync, it completely seems to fix this and other issues I had here