This is a bit odd. From my feddit.uk account (this one) I get the above for posts on !dailybunnies@lemmings.world.
If I log into the account they were posted with (this is my bot) on lemmings.world they display as expected:
If I log back in as myself on feddit.uk website, the images also display as expected (Connect doesn't seem to want to upload this one, but you'll see it without logging in at feddit.uk/c/dailybunnies@lemmings.world).
What's different?
I tried a couple of other instances I have accounts on, and they worked. So it looks like it's this specific combination of feddit.uk + Connect which doesn't show those images!