Sometimes mobs do not activate onDeath skills and revert to vanillish mobs when they die
I remember over a year ago, there was a similar issue where when a mob would die it would sometimes turn to a vanilla mob that just meleeattacked you (if the vanilla mob behaved like that) and was invincible. The mob itself could not be removed from /mm m killall either
Anyway I though putting that in there may help because this feels super similar in the sense that it is sporadic, hard to reproduce and happens to all types of mobs including ones with no skills. This older bug I am talking about was reproduced with no other plugins on the server so I'm going to assume there aren't any conflicts with other plugins here
Here is a video of it happening https://www.youtube.com/watch?v=Z6Wav_nIEAw&feature=youtu.be
Notice it dropped XP orbs and an emerald as it kinda just reverted to a regular vanilla mob. I believe the skills are completely irrelevant here (happened to a lot of my mobs so I had to revert to an older MythicMobs version) nonetheless, here is the mob file for this mob https://pastebin.com/uEQtRXKf
I hate to be ambigious here but, I can say that when this did happen a PandeLoot error was pasted but I do not have it on me at the moment, probably something to do with mythicmob something something null something something bad
I am now using MythicMobs-5.1.3 and this was happening on the dev builds of MythicMobs-5.2.0, I'm not sure where inbetween this began.