I’ve had the same issue. Building with warrior, I can get the Jetson to boot just fine and I can shell in no problem.
Looking at serial output, it’s detecting an HDMI cable is plugged in and detecting the panel just fine. It just doesn’t output anything and the panel goes back to an active input. Similar behavior with DP.
I don’t know enough about Yocto or even Linux in general to know what that ultimately means or how to fix it.