I think that’s what it says but that’s the error I’d say I get about 40% of the time when trying to view image posts. Is this a sync thing or something else?
Kiwi here, no such issues with my Sync. Is there a particular community where you see these errors mainly (if so, can you link it here)?
Also, when you get those errors, it might be worth accessing that community directly using a local account - and if the images load fine, that would point to a federation issue with your server.