https://reddthat.com/nodeinfo/2.0.json
Reddthat instance doesn't have the correct version set in their nodeinfo. It is empty, this is important for federation (and for Jerboa to know which API implementation that it needs to use). Now I don't know if this is a Lemmy problem or just a problem with just that instance. But Jerboa behaves as expected
How it should be
Its bug in listingpostmode. We ll be fixed in the next release. The card post modes show it properly