Apparently it’s not it. nostr:npub1zafcms4xya5ap9zr7xxr0jlrtrattwlesytn2s42030lzu0dwlzqpd26k5 has lockdown mode on and it works. Opened an issue here:
Discussion
I saw it pop up in the photos app, weird. But absent from notes, and other shareable text based apps that have.