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Not sure why, when server starts and entities are being spawned (I suppose) this exception appears up to couple dozen a second:

[10:22:33 WARN]: java.util.concurrent.CompletionException: java.lang.NullPointerException
[10:22:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
[10:22:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
[10:22:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1159)
[10:22:33 WARN]:        at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
[10:22:33 WARN]:        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
[10:22:33 WARN]:        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
[10:22:33 WARN]:        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
[10:22:33 WARN]:        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
[10:22:33 WARN]:        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
[10:22:33 WARN]: Caused by: java.lang.NullPointerException

After that, it randomly appears up to few times a minute.

Model Engine 4.0.8 purpur-1.20.4-2175.jar