Entity in cart crashes move command when moving entities, too

Server Implementation

Paper

Server Version

1.21.11

Describe the bug

When attempting to //move a minecart with a entity inside the command crashes on a entity nullpointer

To Reproduce

Get a entity into a cart
attempt to //move -e the selection with the entity inside
cart and entity get separated

Expected behaviour

Cart with entity staying connected and no crash happens

Screenshots / Videos

No response

Error log (if applicable)

[23:23:13 ERROR]: An unexpected error while handling a FastAsyncWorldEdit command
java.lang.NullPointerException: Cannot invoke "org.enginehub.linbus.tree.LinCompoundTag.value()" because the return value of "com.sk89q.worldedit.entity.BaseEntity.getNbt()" is null
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.fastasyncworldedit.core.queue.IChunkExtent.createEntity(IChunkExtent.java:129) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.fastasyncworldedit.core.queue.IChunkExtent.createEntity(IChunkExtent.java:123) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.fastasyncworldedit.core.extent.PassthroughExtent.createEntity(PassthroughExtent.java:223) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.extent.AbstractDelegateExtent.createEntity(AbstractDelegateExtent.java:143) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.EditSession.createEntity(EditSession.java:4095) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.function.entity.ExtentEntityCopy.apply(ExtentEntityCopy.java:181) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.function.visitor.EntityVisitor.resume(EntityVisitor.java:70) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.function.operation.Operations.completeBlindly(Operations.java:74) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.function.operation.ForwardExtentCopy.resume(ForwardExtentCopy.java:449) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.function.operation.Operations.completeBlindly(Operations.java:74) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.EditSession.moveRegion(EditSession.java:2022) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.command.RegionCommands.move(RegionCommands.java:597) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.command.RegionCommandsRegistration.cmd$_move(RegionCommandsRegistration.java:924) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//org.enginehub.piston.CommandManager.execute(CommandManager.java:157) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.extension.platform.PlatformCommandManager.lambda$handleCommandOnCurrentThread$16(PlatformCommandManager.java:712) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.extension.platform.PlatformCommandManager.handleCommandTask(PlatformCommandManager.java:733) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.extension.platform.PlatformCommandManager.handleCommandOnCurrentThread(PlatformCommandManager.java:714) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.extension.platform.PlatformCommandManager.lambda$handleCommand$14(PlatformCommandManager.java:685) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.sk89q.worldedit.extension.platform.AbstractPlayerActor.lambda$runAction$2(AbstractPlayerActor.java:717) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.fastasyncworldedit.core.util.task.AsyncNotifyKeyedQueue.lambda$run$0(AsyncNotifyKeyedQueue.java:48) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.fastasyncworldedit.core.util.task.AsyncNotifyKeyedQueue.lambda$call$1(AsyncNotifyKeyedQueue.java:58) ~[?:?]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[?:?]
at FastAsyncWorldEdit-Paper-2.15.1-SNAPSHOT-1271.jar//com.fastasyncworldedit.core.util.task.KeyQueuedExecutorService$KeyRunner.lambda$run$0(KeyQueuedExecutorService.java:150) ~[?:?]
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1423) ~[?:?]
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387) ~[?:?]
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312) ~[?:?]
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843) ~[?:?]
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808) ~[?:?]
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188) ~[?:?]

Fawe Debugpaste

https://athion.net/ISPaster/paste/view/35223b907f5d45919f2b4d943cbb4352

Are you interested in contributing a fix?

No

Start at com.fastasyncworldedit.core.queue.IChunkExtent.createEntity, especially line 129, and trace the entity copy path through ExtentEntityCopy and EditSession.moveRegion. Reproduce //move -e with an entity inside a minecart on Paper 1.21.11. Done means the move no longer crashes and the minecart and contained entity remain connected.