Bukkit

I have been having an issue where Zombies and Zombified Villagers will despawn randomly even while nametagged or holding an item.  When I remove the ClearLag jar the problem stops.  I am not sure if I have a setting off somewhere but it all looks right to me.  

The mobs will despawn outside of the standard timed /lagged clear, and don't seem to be on a set timer, it seems to be pretty random as to when they despawn. 

Config: https://pastebin.com/r8GMGyrB

just an idea as i am also trying to use both plugins:

in the config of "clearlag" it is possible to exclude worlds and characters from the deletion.