can't configure button 7 + button 8 (select + start) in game exit button combination.

[PaPa S]

The gamexit button combination in the launchbox defaults to button 7 + button 8 (select + start) by default.
After clearing this and deleting it, when I try to enter the button 7 + button 8 combination again, only button 7 is input.
Button configurations other than the above combinations are entered normally.
This is the same bug in both launchbox and bigbox.

And I'm curious that the game controller button mapping in the launch box is not shared with the big box.

Why is it a separate, independent setting?