Hi,
I see that when I switch off one of cameras from the rig (by manually going through the list of cameras and switching it off) it still used for texturing the model. Not sure about mesh.
I see in user interface that it is off. But I also see that the static pattern visible on this camera gets imprinted into the model.
Metashape version 2.1.2 (18548). Texturing is done on GPU.