Good. There is a debate among some of us about this. As I said, some say it is by design, some say bios error. Back years ago, this would have been called "a bug-like feature".
You have to decide about secure boot, now that you know what the issue is. Personally, I would keep secure boot on, and hope for a future bios update.
Intel says it is design future. I say it is bad design. However, you should know that even when the Secure Boot is enabled and the functional keys menu is invisible, still the keys are accepted.