Can't change the Testing Base URI

I am currently trying out twitch extension development and I’d like to change the Testing Base URI in order to host the assets from another machine on my local network.
However, when I change the Testing base URI and click “Save changes” I am taken back to the Version status page and the new URI is displayed, but after reloading the page(without resubmitting the form) it changes back to https://localhost:8080. That sure enough is still the URI the extension is looking for it’s files at. What could be causing this?

Is the problem still persisting, someone had a slightly different issue with the dev site around about the time of your posting and the powers that be may have fixed your issue

No the problem seems to be fixed. Thanks for letting me know!