Hi, there!
Just got my scratch org set up for Offline Mode development, but running into an issue where the quick action for the offline view is namespaced, so the Offline App is not able to find the experience. Has anyone else encountered this issued?
Firstly, thank you for your reply. It's nice to know I'm not just riding the "crazy train" alone.
My company submitted a Sev 1 bug with Salesforce and they basically told us there is no solution in the short term. We use a similar setup to the one you laid out - we deploy the offline experiences directly into a non-namespaced org, and then install our 2GP package version to test. It's been a real pain, as it essentially puts a barrier of development and testing between front-end and back-end.
I really hope they fix the issue soon, but I'm not holding my breath.