Open cmd window, set the color to 2f (green background, white text); observe the color change
Resize the window, the color changes back to black, with the "text" portion of the window still left in 2f.
This behavior can be repeated every time a resize happens.

This is the external half of MSFT:34761400

Yep, okay this is weird in conhost now. I bet this was caused by fixing #3848.

Since this one's a partner bug, we've gotta get this sorted out in this OS release.