Preface: A UEFI, the sucesssor to the BIOS, can contain a Compatibility Support Module (CSM). It's a compatiblity layer that allows the firmware to boot legacy MBR-based operating systems, but it also provides legacy BIOS functions even if the OS is booted in UEFI mode, for example BIOS interrupt calls.
My UEFI provides an option to disable the CSM: Screenshot.
If I do that, Speccy fails to report the model name of the mainboard: Screenshot. Beside that, the "BIOS" submenu in the "Motherboard" menu is also empty.
If enable it, everything works fine: Screenshot.
This bug is likely