Backpack doesn't render and there is no option to change the backpack in customization

Having this same issue intermittently. It seems to render when I FIRST install it with Curios. But occasionally, I'll unequip it - then requip it, and it will VANISH. I still hear the equip and de-equip. But it won't render. I thought it was a conflicting mod, but all the other Back Rendering items with Curios work fine - it's just this one that breaks. Using same version.

It came back after turning off Shoulder-Surfing. But then after removing the mod and restarting the client - it lost its render again. Not sure why that would happen. It's very strange.