Alphabets not updating if scrolling the actual list

[kct-ztx]

Hi,

This seems to be a must feature I don't seem to find and not sure how anyone else is working with it. When I scroll through the alphabets on the right, the list scrolls to update position. A vice-versa is also expected, when I scroll the actual list of items, the selected/current letter should be updated on the right in the alphabets list as well right?