sometime mobs despawned after death (2)

mm version : 5.7.2 video : https://youtu.be/NEQBrtVBRbs you can see video that has 6 monster before death, but after death, only 3 monster was remained. i also set despawn to PERSISTENT, but still same.

also sometimes modeled mob's model was removed after respawn,

this mob was spawned in "MythicDungeon", i think mythicmobs in instanceworld create by mythicdungeons has some problems.

this problems happend after update 5.5.1 to 5.6.2. (same in lastest build) I noticed this problem and rollbacked the version back to 5.5.1, and the problem disappeared. this problem caused by update mythicmobs.