It's supposed to be in-device. So, a firewall or ad block wouldn't interfere with it. Maybe they don't have the local database to reverse locations...
Discussion
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Hey nostr:npub1gd3h5vg6zhcuy5a46crh32m4gjkx8xugu95wwgj2jqx55sfgxxpst7cn8c would you know anything about this?
For reference, the app uses this class: https://developer.android.com/reference/android/location/Geocoder
Fix this
Can confirm no Geocoder implementation currently exists.
It would require us adding it to the GMSCompat layer that we provide for sandboxing Play Services.
Please add an issue to: https://github.com/GrapheneOS/os-issue-tracker/issues
If this is something you'd like to see provided.
Investigating...