Posted this problem on the AMD thread in reddit but maybe here it will receive more attention. I bet is not only the icons that have this problem but users still didn't noticed it.
. Recording the desktop with any program and watching the video show correct icon color
. Used same driver with the RX480 (no problem with the RX480)
. Tested a Reference model and the MSI Mech but also shows the same dark color
. Only used the HDMI output of the XT