Android : "Screen overlay detected" when scanning for MetaWear tag

Question

I got this nice new MetaWear C device, and I've been building an Android app that collects accelerometer data, no problem. Except all the sudden, when I start the scan via the BleScannerFragment, I get, following the location permission request, the message "Screen overlay detected", with an option to "Open Settings". This option opens the screen overlay permission settings, but I cannot grant permission to the application, because it does not list it in its Manifest.

When I re-installed the MetaWear app, I get the same issue. I could add the SYSTEM_ALERT_WINDOW permission to the Manifest in the SDK, but I'd rather not go there. Adding the permission to the Manifest in my own project did not solve it.

Has anyone run into this problem before and have any idea how to solve it? Thanks.