I recently installed 10.15.4 beta and the TV I'm using for external display has serious color issue. It used to work well but now the images are all in purple and green. The only solution for now is to turn off the UHD setting on my TV. But then the refresh rate is restricted at 30Hz. I know Apple did some tweaks on the video output because there is a new check box for "Prefer HDR Mode" in display setting. Anyone have the same problem? I wish it's just a bug with the color format and not because they change the output format which will make my TV uncompatible with my Macbook.