server crashes

[graperpie]

i believe this only happens in higher player counts (100~ to 200~)

crash report:

[graperpie]

earlier on a similar crash happened on a different block type:

[09:30:47] [Worker-Main-70/ERROR]: Caught exception in thread Thread[#9037,Worker-Main-70,8,main]
java.lang.IllegalArgumentException: Unexpected palette resize, bits = 7, added value = Block{minecraft:ancient_debris}
at knot/net.minecraft.class_2835.method_74154(class_2835.java:9) ~[server-intermediary.jar:?]
at knot/net.minecraft.class_2814.method_12291(class_2814.java:41) ~[server-intermediary.jar:?]
at knot/me.drex.antixray.common.util.controller.ChunkPacketBlockControllerAntiXray.obfuscate(ChunkPacketBlockControllerAntiXray.java:223) ~[antixray-fabric-1.4.10+1.21.9.jar:?]
at knot/me.drex.antixray.common.util.ChunkPacketInfoAntiXray.run(ChunkPacketInfoAntiXray.java:29) ~[antixray-fabric-1.4.10+1.21.9.jar:?]
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute(ForkJoinTask.java:1750) ~[?:?]
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute(ForkJoinTask.java:1742) ~[?:?]
at java.base/java.util.concurrent.ForkJoinTask$InterruptibleTask.exec(ForkJoinTask.java:1659) [?:?]
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511) [?:?]
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450) [?:?]
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019) [?:?]
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187) [?:?]

[DrexHD]

I have never seen this error before, are you using any mods like async that may cause unexpected behavior like this?