Maybe a little off-topic but I’ve had the same issues with a surface tablet. Working in windows 10, had a crash (a critical process died) and afterwards only booting to the BIOS
It seems to be something with secure boot and the loaded keys.
I know it doesn’t solve the issue but maybe it’s helping with troubleshooting.
I’ve erased the keys for secure boot and installed the factory default keys, from that point it recognized ti’s drive again. Before that, from winpe in diskpart it didn’t see any drive in there