Had noticed some other post like that, but can't find it rn. The 2 y.o. post from the Touhou community though, https://lemmy.world/post/16392656, I took note before hiding through Ublock Origin filters. It was likely pulled from either my RSS backlog or a script for redirecting posts I open to Mbin instances, since there's an entry for the OG link as a TBB search in my history. If the post's been federated just now to here, maybe Mbin after whatever happened earlier today is considering as "newest" the date a post's been added to the database, instead of what's reported on the datetime and related fields?