App-service with docker erratic behaviour of registry.

Hi, I've tried to find a place to post this issue but to no avail, and this is the closest I can find in terms of a public issue tracker for Azure App-service.

Using a Linux Azure App-service with a Azure container registry in another subscription breaks the container settings. Sometimes the App-service thinks our azure container registry is a "Azure container registry" (settings tab), and thereby fails on pull, sometimes it thinks that the same url is a docker hub registry(settings tab). But it never chooses the private registry(settings tab) that I know is what works. Both according to the portal tooltip but we also have it working int another app (with the same settings!).

Please either improve error messages or preferably, make the app service handle this better.

Regards.