Guitar post-bend 1/2 step not showing up

I am unable to get the 1/2 to display on a guitar half step post-bend. Anybody know why? Engraving options say it should be there.
Also curious, and perhaps related, is that the interval for minor second does not seem to exist in the dropdown menu.

I think you mean 1/4, not 1/2? Have you set the “Microtone bend” property?