Imported timeline data not showing in Android app

I’ve started running the Dawarich Android app 10 days ago, logging locally without any server upload.

2 days ago, I set up a self-hosted instance of Dawarich following the instructions, hosting it behind a Traefik reverse proxy. Upload of the local Android location data went fine, they show up in the web app.

I have also imported my Google timeline data using the web app: a lot of points (462 000), dating since 2011. Import & extraction took some time but finished fine, and the location data shows fine in the web app.

But I still can’t see any of the imported Google timeline data in my Android app. Clicking any date simply says 0 points, greyed out date tile. I only see locations on the dates that the Android app logged data itself:

Not what I expected - do things work differently? Am I overlooking an obvious mistake somewhere?

Thanks for any help!