OBJ export from mpq files

[CaufendraSunclaws]

Hello,

I'm using wow.export to get the Northshire abbey into unity/blender. I got an old WoW client version (1.12) and I found the abbey using the legacy/mpq menu.
It looks ok in the models tab but when I export it to obj, some materials are not exported / assigned wrong

Preview correct :

Export imported in blender or unity (both KO)

I should add that the material is missing completely from the export but is shown as the first texture in the preview