@slytheringirl opera://activity (and opera://startpage/activity) open right windows with tabs, but still icon don't re-appear.
It's funny, because I totally forgot about this topic because for a while there was not a single response. Yesterday I've got notification about new post here and it looks like there was some feedback. Nice
Unfortunately this issue is still present, even after over 1 year and I don't know what triggers it. Sometimes Opera opens up and icons is right from the start. Sometimes (more often) Opera opens and icons is missing and later it appears.