Hey @JxE @chrislesage I tried replicating this with a generic 4k monitor on a mac mini and I was unable to. I think it may really be limited to Retina displays.
Hopefully, Miq is successful in his MBP campaign so we can actually try and chase this down.
If anyone has an (i)mac of any kind that they would let me remote into, I can try to debug it from there. “Anydesk” is a great application for this sort of thing.
Cheers!