Just got a MacBook Pro 2018. Upgraded from the 2017 MacBook Pro
I use my MacBook Pros in nightmode 24/7 since the bluelight hurts my eyes. I enabled nightmode on my new macbook pro and hooked it up to an external monitor but the cursor is unaffected by the nightmode changes.
I checked my 2017 and 2012 macbook pro and both change the cursor as well on the external monitor, just not the new macbook pro...