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.)
• I have provided my client version in the details. (type /ver into your game window)
• I have provided proof of my claim (era videos, links to era wiki and/or forum posts) Lack of proof will slow down fixes and prioritization. Please provide details so that developers' research time is minimized.

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

[59blargedy]

could you provide info on how you're zoning? i.e. char 1 zones then char 2 lullabies then zones? or zoning at same time? char 2 lullaby then zone then char 1? i assume you're lullabying the nms vs. the regular mobs? anything else you can think of?