Yeah - that's the field that's no longer used.

The other field needs an lnurl address so that a new LN invoice can be fetched for the zap. 

 Confusing, it says lnurl is outdated but wants an lnurl in the ln address field?  

 Yeah. I'm pretty sure it was from 2 overlapping nips for recording lightning addresses.

Nostr has always used lnurl.