Crashes when starting a webapp from a package

E.g. https://software.pureos.net/package/bin/amber-updates/epiphany-webapps-com.arstechnica

** (Ars Technica:3652): ERROR **: 12:03:23.358: Epiphany is trying to access web app settings outside web app mode. Your web app may be broken. If so, you must delete it and recreate. See epiphany#713.