Newletters in Synced RSS feed

Nearly six years after the last post in this thread, so I’m not sure if this will be noticed, but I’m having this exact issue with NewsBlur when logged into and syncing with the Lire app on iOS. Newsletters do not show up in the feed until I open the NewsBlur app or website and refresh them from there. Then they sync to Lire and I can read them there. Feeds are acting normally, it’s just a sync issue with newsletters forwarded to NewsBlur. What’s the fix for this?