PaperMC
"allow-unsafe-end-portal-teleportation" don't working
Expected behavior
sand duplicator it's working
Observed/Actual behavior
sand duplicator don't working. But it works as expected on a vanilla multiplayer server.
Steps/models to reproduce
build a sand duplicator or download this world: https%3A%2F%2Fwww.mediafire.com%2Ffile%2Fzqkh8oq7jujdou0%2FMax%2BEfficiency%2BSand%2BDuper.zip%2Ffile&v=lCYR2FN20lk
Plugin and Datapack List
BoundlessForging-1.0-SNAPSHOT CleanPing ColorfulChat-2.1 LagFixer LuckPerms-Bukkit-5.4.116 PlayerDoll-1.29 tabtps-spigot-1.3.24
Paper version
1.21 build #37
Other
I guess you tested with this example: https://www.youtube.com/watch?v=lCYR2FN20lk. The latest comment on the video said it was broken by the update and i can't reproduce even in singleplayer. The game seems to have a boolean to allow falling block duplication at some point. However this specific design doesn't work anymore since passengers of a vehicle can now gets teleported by the portal (here the pigs). Do you have more infos about that, does the pigs still wait in the overworld for you?
Given concerns about the new entity stacks being able to teleport thing, I tested an older design for a sand duper and I'm unable to reproduce this issue running Paper version 42. This attached design works dupes sand both in singleplayer and on the Paper server, running no plugins or datapacks, with the allow-unsafe-end-portal-teleportation option set to true. 12GT Sand Duper by Scorpio.zip
It seems to come from the Multiverse NetherPortals plugin on my side. I have the same bug with this plugin and it fixes it by removing it.
I don't know how to keep the plugin and fix the bug at the same time.
Maybe try removing your plugins one by one to find the one that cause the bug on your side.
Going to close this, as sand duping appears to be working for me and others ^
