Just to add a follow up to this in case anyone wants to see if there's an issue with their camera combination, use cam_test.py from the depthai-python/utilities. I have three colour cameras hooked up to my FFC-3P, you may need to change the c to m if you have mono cameras. You can see in the second image that with the IMX378 enabled with the AR0234 the white balance and image quality is reduced.
cam_test.py -cams left,c right,c -ds 2
cam_test.py -cams rgb,c left,c right,c -ds 2
I'm still discussing this with Luxonis support but as it isn't listed as a supported configuration and as the depthai gives a warning I have low expectations. It's on me to figure out what combos work before buying, adding this note here to help others avoid the pitfall if possible and hopefully follow up with a solution 🙂
