Probably cause replied on primal.
nostr:npub1rzg96zjavgatsx5ch2vvtq4atatly5rvdwqgjp0utxw45zeznvyqfdkxve look at John’s reply, it doesn’t have everyone tagged. Not sure why. Even when I reply to it, it doesn’t tag everyone else. Maybe we need to keep the nostr: in the text replacement 🤔 
Discussion
My reply (screenshot) is from damus. I think maybe this is the difference between a tag and a mention that nostr:npub1pefpytg7h9wdmza97evpta73eyf94rq5mq5cn6h992eknm4xcljqq2tv2p was talking about yesterday 🤔