Looking at this, it appears the comment you linked includes a community link, not a crosspost link. Tapping the link seems to open the the correct community to the post feed. I see the community looks quite new, perhaps you were the first one on your instance to interact with that community, which could mean there was just a delay in federating the rest of the posts in that community. Is it possible you opened that link expecting it to open a single crosspost, and instead it opened to a community with only one post showing, thus mistaking it for an open post the views are quite similar in appearance)?
If not, I may need some clarification on this issue, perhaps I misunderstood.