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I have observed that complex mobs with many skills and Auras are not properly unloaded when chunks are unloaded, either due to player movement, or logging out. Mobs will continually load and unload from persistent data. When mobs are saved to persistent data on chunk unload any pending skills, auras, or actions should be cancelled as their highest priority event. Adding delay 0 in skills can help with this somewhat, but is not a catchall, and often does not work correctly for skills that use non 0 delays as part of their mechanics. This has gotten worse in 1.21/ mythic 5.7.0