http://dds6qkxpeiqvogt4y2fd7vtsxq6pvokekb2h4la7jd4iwl4ljuawu5qd.onion/wiki/Browser_Tests
If the real, external IP address can be revealed from inside Whonix-Workstation, then this would constitute a serious and heretofore unknown issue (otherwise not). It is unhelpful to ask questions in forums, issue trackers and on various mailing lists with concerns that have already been discussed, or which are known issues / false positives.