I do have WSL images with Leap 15.2 and it seems that zypper doesn't register
outdated repodata cache.

Let's say that I'd  start WSL image (bash session) once per two weeks, and if I
simply run "zypper up" after these two weeks zypper reports no update, until I
clean repodata 

I didn't call refresh simply up && clean --all && up

and that worked fine. However I'd like to avoid situation when zypper simply
reports no update with sporadically WSL use and user gets to believe it.

My initial thought it's that this is caused by not having any services running
inside the "container", however Ludwig things something might be wrong with the
date/time inside the image.