I dont think its filtered. Its because this alert function has not yet been build.

What do you think nostr:npub137c5pd8gmhhe0njtsgwjgunc5xjr2vmzvglkgqs5sjeh972gqqxqjak37w ?

https://iris.to/note163d9wt5mlnhkc4fxetrm9e63hh42kls6ux0x6hjl2vuspntjus7sakuy3z