One of my apps has "#CanInstallToExternalStorage=true". For a test I removed the sdcard and then I wasn't able to update from playstore and even manual (via b4a bridge). Message was "not installed/app update not compatible".
Seems that the app ist still installed (can't see it, even with a tool). I cleared the cache, etc. from the playstore but only a full reset of the phone worked.
Does anyone know where android stores further data of installed apps? (I think there's a link to the sdcard which was still there).