Cannot use Oauth2 with a mobile device when nuxeo-web-mobile* is installed

Filling in the username / password on the mobile web login page ends up in a regular login procedure instead of getting the authentication code through the given redirect uri.

The actual authentication url is
http://192.168.56.101:8080/nuxeo/site/mobile/auth/login?targetURL=oauth2Grant.jsp

After the login page, I got redirected to
http://192.168.56.101:8080/nuxeo/site/mobile/social

The test was performed with an Android emulator.