Problem: Pagination may cause posts to be skipped in federation
This isn't confirmed but coming out of a discussion about ActivityPub collections at https://socialhub.activitypub.rocks/t/implementing-paginated-inbox-collections/1919/4?u=weex in the section Example Inbox Implementations, @mag there supposes that the way pleroma does pagination may cause some posts to be skipped if a post is made while fetching is going on. Opening this to track investigation.