deathknell mob crashing world.exe

Master core revision 2f0cbe1a695 , boost 166, MySQL 5.6.43 TDB 735.00_2018_02_19

system win 10, x64, including latest patch OS build 17763.1 and 17763.503 (DISM updated the os) RAM 64 gig

I get an exception code of E0gD7363 in the kernelbase.dll

What the world.exe shows is;

"Unit (entry 1502) is trying to delete its updating movement generator (type 5)!

Unit (entry 1502) is trying to delete its updating movement generator (type 2)!"

World crash! bnet stays up.

this only happens in deathknell. Other zones work, what is odd is that this was working as I progressed thru the deathknell zone.

I can reproduce this with a second computer (slight modifications to configuration, install but nothing significant), same thing!

This started about a week to week and a half ago.

What I have done;

I have DISM.exe system, I have scannow the drives. no errors reported.

turned off all antivirus/firewalls.

I have deleted the world dbase and repopulated the world dbase.

Windows memory diagnostic tests, nothing.

recompiled server.

repopulated the /DATA for server DBC’s etc from fresh data.

delete client cache files.

Server folders location; 1. win 10 /documents and 2. separate harddrive .

I would initially think memory failure / harddrive fault but the duplication across two computers makes this very unlikely.

suggestion? Help? things to try?

I can provide the crash report upon request, best to ask for a snippet if this is a next step.

found a reference that discusses this. need to delete a mob from the dbase to fix it.