Interesting. As a photographer, it is important to set WB in the visual spectrum even when using raw capture. By not setting WB you are liable to clip a single colour channel so that when you make colour corrections in post, you will end up with...
Just a thought, could be wrong, surely IR has no colour temperature. Depending on the IR frequency band width, you add faux colour to provide a certain type of image but the visual colour spectrum doesn’t exist outside the visual colour range...
I suggest you take heed of the following video made available by Transport Canada (posted previously but worth repeating). I know of one drone operator who crashed his drone being unaware of the hazards of operating around tall buildings...