Den of Rancor crashes when training mobs to zone

[danielson144]

Checklist

• [X ] I have searched for existing issues for issues like this one. The issue has not been posted.
• [X ] I have provided reproducible steps. (No "as the title says" posts please. Please try to state facts only, and avoid assumptions/opinions.)
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Details

Version 30181205_0 Den of Rancor When camping the Tonberry Tracker/Tonberry Decapitator NM's near the zone to the Temple, I've been pulling mobs and running to the zone, when I zone, I'll foe lullaby on my other character and also zone with that character. Sometimes upon zoning back, the entire Den of Rancor crashes and all of the NMs respawn. This is not something I'm trying to do. But I am trying to camp these NM's and it has happened maybe 10 times. Might be worht looking into.

[Steam-arch]

Sounds very similar to the old Qulun bug