I running graphene too. Are you on the latest version of both apps?
I cleared storage and uninstalled both and started from scratch. Now Amethyst crashes when I try to log in with Amber nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z
I'm running GrapheneOS so wonder if that's because of app sandboxing?
I running graphene too. Are you on the latest version of both apps?