but are we talking Chex Quest 1 or 3? also, i noticed something about the mod as of late. it seems some monster only mods won't quite work with this. like for example, i was trying out an old version of Ashes 2063 enemies for the Ashes mod itself. and it worked out fine, but then i tried out the newer monsters pack. and it gave an error
Whatever uses the Chex quest items is compatible, it's something zDoom and its successors check for as their own different actors.
As for Ashes 2063, it seems like they introduced their own weapons laters, which is what's probably causing conflicts. Zandronum doesn't mind these but GzDoom's Zscripts do. It's the reason why other gameplay mods won't work with stuff like MyHouse.wad unless you remove the custom weapon stuff yourself. Not much we can do on our side about that.