Oddbean new post about login | logout Yes exactly. I also posted a note via Primal and added nostr.buil link manually and in that case hashtag didn't work either.
‘Post directly to nostr’ is a new feature so we might need to do something to how we publish hashtags. If you copy and paste a nostr.build link, that's different. We are just a link to an image and # issues would likely be related to the client.