Allow selecting origin/destination from suggestions by with Tab?

When I'm typing my origin or destination in the text fields, and I'm provided a list of suggestions, I'd find it intuitive to hit the Tab button when the correct suggestion is focused, and this action would confirm that suggestion as the origin / destination and take my focus to the next UI element. However, hitting the Tab when in the suggestion list only leaves the text field empty and removes the focus. This is what happens in HSL Reittiopas when typing and then trying to select and proceed with Tab:

I've also tested with this https://jyvaskyla.digitransit.fi/, same issue there.

Everything works just as expected when I use Enter instead of Tab, and I think it's fine - Tab completion & focus change just seems to be standard behaviour on many common sites so it feels a bit weird that Reittiopas & Digitransit are missing this UI behaviour. Would it be possible to allow using Tab here?

Reproduce the behavior in the origin and destination suggestion fields, then trace the frontend keyboard handling for the suggestion list. Done means Tab confirms the focused suggestion and moves focus to the next UI element, while Enter continues to work as before.