Potential firmware issue causing memtest86+ 6.0 to boot into blank screen?

Development build of Memtest86+ 6.0 boots into a blank screen on my Framework Laptop. A developer working on the project says this could be a firmware bug. Could anyone on the Framework team please take a look at the issue?

See Build issue on Gentoo and booting to a blank screen on laptop with 11th gen Intel CPU · Issue #40 · memtest86plus/memtest86plus · GitHub for details.

Update: after further investigation from the memtest86+ developers, the problem is more likely within the code base of memtest86+ itself, not the firmware of the laptop.