Hello,
I'm able to reproduce your color thing. It seems you enabled the High Contrast Color ;-)
=> https://drive.google.com/file/d/1kx1MjOodOYVaZsjz6sGCP9ALDMwBN6rc/view?usp=shari...
About your Quest 1, I saw your video, I don't have Quest 1, so I can't confirm latest QGO versions are still working on it. But as you can see QGO doesn't seems to have the same behaviors and the QGO view is way bigger (I had to make it big because of v69) to fit the correct size after this v69.
Firmware v50 is really too old now...
QGO is designed to run on latest firmwares because Meta broke too many things in all the firmware, so the QGO behavior fits teh more recent ones.