When I access the mobile site on my mobile and come to see that there is an unread notification (identified via the red marker over the notification icon), tapping on the notification icon shows notifications from other wikis too.
OTOH, when I access the desktop site (with MinervaNeue as chosen theme) and observe that I have unread notifications (again identified via the red marker over the notification icon) and click on the notification icon, I'm unable to see notifications from other wikis. This is also confusing because the red marker indicates the presence of unread notification but when I click I'm not shown any unread notifications (which is the case if I only have unread notification from other wikis). I would like to see inter-wiki notifications on desktop too when using the MinervaNeue theme.