Kselect scroll functionality on mobile is partially broken

[marcellamaki]

I am testing with the dev tools not on actual mobile device, but what I'm noticing is that the KSelect goes up and that you can't scroll within it quite all the way? There's some amount of scrolling that works, but some of the question items are cut off, and even when I do scroll, I can't get to those questions < 4 depending on the position of the popover. It may be a pre-existing issue to KSelect and this is just an odd manifestation of it

scrolling.mp4

Originally posted by @marcellamaki in #12384 (review)