Sanitized production log excerpt (not the full crash report).
Crash: 2026-10-17 09:27:52, server local time (UTC-7).
Minecraft 1.21.1; NeoForge 21.1.250; Windows 11 amd64; Java 23.0.2.
Sable 2.0.5; Waystones 21.1.42; Balm 21.0.65.
Create 6.0.10; Create Aeronautics 1.3.2; sable_sa_compat 1.0.4.
Sinytra Connector 2.0.0-beta.17+1.21.1 is also installed.
Large modpack; no minimal reproduction or test without Connector completed.

[Server thread/ERROR] [MinecraftServer]: Encountered an unexpected exception
net.minecraft.ReportedException: Exception ticking world
    at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1041)
    at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:317)
    at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:917)
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:707)
    at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:267)
    at java.base/java.lang.Thread.run(Thread.java:1575)
Caused by: java.lang.UnsupportedOperationException: Cannot change blocks in nonexistent plot holder
    at net.minecraft.server.level.ServerChunkCache.handler$haa000$sable$blockChanged(ServerChunkCache.java:3715)
    at net.minecraft.server.level.ServerChunkCache.blockChanged(ServerChunkCache.java)
    at net.blay09.mods.balm.common.BalmBlockEntity.sync(BalmBlockEntity.java:172)
    at net.blay09.mods.waystones.block.entity.WaystoneBlockEntityBase.onLoad(WaystoneBlockEntityBase.java:152)
    at net.minecraft.world.level.Level.lambda$tickBlockEntities$0(Level.java:547)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1597)
    at net.minecraft.world.level.Level.tickBlockEntities(Level.java:543)
    at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:428)
    at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1037)
    ... 5 more

[Server thread/INFO] [MinecraftServer]: Stopping server
[Server thread/INFO] [MinecraftServer]: ThreadedAnvilChunkStorage: All dimensions are saved
[Server thread/INFO]: Thread RCON Listener stopped
[Stuck Thread Watcher/INFO]: Stuck Thread: "Thread-17" Id=215
[Stuck Thread Watcher/WARN] [AllTheLeaks]: Seems like you crashed and the server got stuck, you might need to terminate the process!

Recovery: after confirming all dimensions had saved and both game/RCON listeners were stopped, the stuck JVM was terminated and the unchanged server restarted. Startup completed and game time advanced normally. This does not prove the compatibility issue is fixed.