onActivityResult not called in DeepLinkActivity

Is there anything special about doing `startActivityForResult` in `DeepLinkActivity`? For some reason, `onActivityResult` is never being called.

To provide some context, the usecase I'm trying to solve is:
1. Catch the deeplink Uri
2. Start authentication flow with `startActivityForResult`
3. Come back to `onActivityResult` and dispatch the original Uri.

Start by reading DeepLinkActivity and tracing the startActivityForResult flow to determine why onActivityResult is not reached. Reproduce the deeplink authentication sequence described in the issue. Done means the authentication result returns to onActivityResult and the original Uri is dispatched.

Written by the indexing model from the issue text.