Estou passando pelo mesmo problema.
nostr:nprofile1qqszpxr0hql8whvk6xyv5hya7yxwd4snur4hu4mg5rctz2ehekkzrvc64twc2
There are times when even using Citrine I can't reply to a message.
It crashes when posting.
It seems that it tries to notify the other user's inbox and when it doesn't succeed it doesn't allow the publication, it could be an attempt at communication and if it doesn't happen let it publish.