No Boot Menu Displayed

Issue: boot menu works, but is not displayed. Linux boots just fine after ~5 seconds of black screen. pressing escape during the black screen causes it to wait indefinitely, and pressing enter repeatedly while in this state resumes booting as normal.
Board: LASER14 (Intel GeminiLake)
OS: Debian 12
Firmware: MrChromebox’s coreboot
I’ve tried rebuilding coreboot and flashing manually, tried building and flashing firmware for other glk boards, same result.
even if this issue is not fixable, I would appreciate pictures of the boot menu so that I can navigate it without the screen if I need to

As a note, flashing coreboot builds not for your boardname is a really good way to end up with a brick