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Paypal - impossible to complete payment through Paypal app

See original GitHub issue

General information

SDK/Library version: drop-in 4.1.0
Environment: both sandbox and production
Android Version and Device: OnePlus 5T, Android 9.0

Issue description

It is impossible to complete a payment if the Paypal app is installed (and is automatically launched instead of the browser).

Steps to reproduce:

created an empty android project with androidx, added drop-in 4.1.0, performed the Browser switch setup (app doesn’t have underscores in the package name):

<activity android:name="com.braintreepayments.api.BraintreeBrowserSwitchActivity"
    android:launchMode="singleTask">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="${applicationId}.braintree" />
    </intent-filter>
</activity>

created super simple activity with a sample client token from the docs page (“Try it now”):

class MainActivity : AppCompatActivity() {
    private val REQUEST_CODE = 2048

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        findViewById<View>(R.id.btn).setOnClickListener {
            val dropInRequest = DropInRequest()
                .clientToken("eyJ2ZXJ.......1vIjoib2ZmIn0=")
            startActivityForResult(dropInRequest.getIntent(this), REQUEST_CODE)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == REQUEST_CODE) {
            if (resultCode == Activity.RESULT_OK) {
                val result = data?.getParcelableExtra<DropInResult>(DropInResult.EXTRA_DROP_IN_RESULT)
                Log.e("result $result", this)
            } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.e("canceled", this)
            } else {
                val error = data?.getSerializableExtra(DropInActivity.EXTRA_ERROR) as Exception
                Log.e("error", error, this)
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data)
        }
    }
}

on clicking the button, paypal is selected and the paypal app (7.6.0, enrolled with biometric access and a working production account) is launched automatically:
however, when my app is resumed, the drop in activity is stuck on an infinite loading, and no onActivityResult is invoked: