Vlad I've noticed this visual bug many times, across at least several versions of Orion, but what I remember is the lack of the blue loading bar.
I restarted Orion and now the reload icon changes to the X icon when I click it, but there is still no blue loading bar.
Interestingly, I can recreate the original version of the issue (no loading bar and no reload icon change) by pinning a previously unpinned tab, then the animations do not show. When I then unpin it, its animations show.