npub1jl…pp2kq on Nostr: So this "Unable to send zap" thing... I remember a couple users have noted this and ...

So this "Unable to send zap" thing... I remember a couple users have noted this and shown similar screenshots... do you know for sure this is rate limiting issue? I thought it was some kind of incompatibility specifically between Amethyst and Primal addresses.... how do you know it's a rate limit?