One comment here is that the M1 does better. No doubt that's true; I haven't observed this particular problem. However, OSX' logic for external monitors doesn'

One comment here is that the M1 does better. No doubt that's true; I haven't observed this particular problem. However, OSX' logic for external monitors doesn't work a whole lot better than for older laptops -- in particular, if I connect it to a monitor that's connected through a Startech KVM it remains stuck at XGA (1024x768) resolution, which reflects the EDID the KVM provides to inactive computers. It doesn't update when the laptop is selected, and there seems to be no way to reset it. Nothing else does that. IMO, it's all indicative of a prototype-level implementation.