I haven't found any sources about this, so the following is just my hypothesis based on the information I could find, and what I already knew. My suspicion is that because the OSD chip hinein the FC effectively receives a different signal than the camera sent (because of a difference https://osd30730.blogzag.com/77760793/線上軟體交付-osd-dinge-zu-wissen-bevor-sie-kaufen