sondingudi I built a ROM for the Pixel 7.
GrapheneOS, or something else? The GrapheneOS community generally does not refer to GrapheneOS as a "ROM" (source).
sondingudi If I build it using the default settings, it boots normally. However, if I add just one app to system_ext, booting the ROM on the real device results in an error: BL1 requested in the bootloader.
How is the app added? It sounds as if perhaps an approach was used that is breaking verified boot.