What relay is that? The tagging didn't work.
Iris now has keyword search by #[0] ! Thank you so much!
It's implementing this NIP https://github.com/nostr-protocol/nips/pull/175 and currently only searching from @npub1xdtducdnjerex88gkg2qk2atsdlqsyxqaag4h05jmcpyspqt30wscmntxy 's relay which supports it.
Discussion
Interestingly, the tagging works when viewing the post on Iris and Amethyst, but not when viewing it from Damus or Snort.
It is not interesting at all, it is a bug and clients are doing feature-creep bloating the protocol by accomodating for invalid tags. Please don't do this #[1] #[3].