Something broke. I think there was no problem when I last visited a couple days ago. Today all posts have only a down arrow for the spillover actions, no icons. If I move the mouse above where the icons /should/ be, the pointer turns into a finger. So the actions are still available but just invisible.
(edit) when I use Firefox and enable displaying images, only then can I see icons. I normally use Ungoogled Chromium with images disabled (images dramatically increase my Internet costs). So I wonder if someone tried to get fancy and install images instead of icons from fonts.
Ok, so I am still not any closer to figuring out what the issue is, but I had it earlier today on my mobile phone when connecting through a mobile data plan. Upon returning home I switched back to wifi and the issue was gone… strangely even when switching back to the mobile dataplan afterwards. Maybe it is somehow related to switching IPs while connecting from different locations or so?
(One pattern of AI scrapers is that they run a full browser server once to get real cookies and so on, and then transfer those to a cheaper server to do the actual scraping, so maybe a mobile data-plan with changing IPs accidentally triggers this).
I use Tor so my IPs would be all over the place, perhaps even changing across the same session cookie.