I've always been downright suspicious of the creation of UEFI. It executes code before the operating system but doesn't really provide a hardware abstraction layer like BIOS does. Most operating system don't use BIOS or any other software layer and configure the hardware themselves. Why is it there then?

And unlike BIOS which is relatively small UEFI is "full-fat" almost the size of an operating system itself. It can even run its own applications.

The 1 million lines of C code comprising UEFI are riddled with bugs and this is just one of them. No doubt LLMs will be able to uncover a lot more of them.