Ugh. Standards. Maybe the safer option would be to don't do inverted QRs if it's badly supported?

Primal app couldn't scan any, and some other clients only with difficulty. nostr:nprofile1qqsdv8emcke7k3qqaldwv956tstu40ejg663gdsaayuuujs6pknw7jspp4mhxue69uhkummn9ekx7mqpr3mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmqpzfmhxue69uhhqatjwpkx2urpvuhx2uc86mqq0 

 I just tested primal with many black QR Codes. It read them all correctly. So, I don't know what the problem is. 

 Hmmm, that's curious. Primal iOS or Android? 

 Both worked in their most up-to-date versions.