Did iOS 26 break geolocation for PWAs?

I am the developer of the Progressive Web App (PWA) FindMeSAR which displays the user’s coordinates in several different formats.

When this PWA is *not* installed on my iPhone 17 Pro then I can use Safari to open this webpage and give permission for it to use my location. FindMeSAR works fine and displays my coordinates as latitude longitude in decimal degrees.

I can also use Safari to open Google maps and geolocation there also works fine.

But if I install FindMeSAR for use offline as a PWA then I get an error message saying location is denied.

My iPhone has the latest iOS 26.0.1

Has anyone else with iOS 26 tried a PWA that does geolocation? Results?

[Edited by Moderator]