On Folia 1.20.6 players are able to pass through the border on vehicles but are not teleported back as chunky is attempting to teleport them away on the wrong thread.
Folia 1.20.6
Chunky Border 1.2.13
Chunky 1.4.10
[14:11:05] [Region Scheduler Thread #3/ERROR]: Thread Region Scheduler Thread #3 failed main thread check: Accessing entity state off owning region's thread
java.lang.Throwable: null
at io.papermc.paper.util.TickThread.ensureTickThread(TickThread.java:78) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at org.bukkit.craftbukkit.entity.CraftBoat.getHandle(CraftBoat.java:114) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at org.bukkit.craftbukkit.entity.CraftBoat.getHandle(CraftBoat.java:10) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at org.bukkit.craftbukkit.entity.CraftEntity.getPassengers(CraftEntity.java:438) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at Chunky.jar/org.popcraft.chunky.platform.BukkitPlayer.teleport(BukkitPlayer.java:75) ~[Chunky.jar:?]
at ChunkyBorder.jar/org.popcraft.chunkyborder.BorderCheckTask.lambda$run$0(BorderCheckTask.java:47) ~[ChunkyBorder.jar:?]
at java.base/java.util.Optional.ifPresent(Optional.java:178) ~[?:?]
at ChunkyBorder.jar/org.popcraft.chunkyborder.BorderCheckTask.run(BorderCheckTask.java:29) ~[ChunkyBorder.jar:?]
at Chunky.jar/org.popcraft.chunky.platform.Folia.lambda$scheduleFixedGlobal$1(Folia.java:29) ~[Chunky.jar:?]
at io.papermc.paper.threadedregions.scheduler.FoliaGlobalRegionScheduler$GlobalScheduledTask.run(FoliaGlobalRegionScheduler.java:179) ~[folia-1.20.6.jar:?]
at io.papermc.paper.threadedregions.scheduler.FoliaGlobalRegionScheduler.tick(FoliaGlobalRegionScheduler.java:37) ~[folia-1.20.6.jar:?]
at io.papermc.paper.threadedregions.RegionizedServer.globalTick(RegionizedServer.java:293) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at io.papermc.paper.threadedregions.RegionizedServer$GlobalTickTickHandle.tickRegion(RegionizedServer.java:148) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at io.papermc.paper.threadedregions.TickRegionScheduler$RegionScheduleHandle.runTick(TickRegionScheduler.java:404) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at ca.spottedleaf.concurrentutil.scheduler.SchedulerThreadPool$TickThreadRunner.run(SchedulerThreadPool.java:525) ~[folia-1.20.6.jar:1.20.6-DEV-d797082]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]```
On Folia 1.20.6 players are able to pass through the border on vehicles but are not teleported back as chunky is attempting to teleport them away on the wrong thread.