[BUG] (create new file) fails during You need to fork this repository to propose changes

[repo-reviews]

Select Topic Area

Bug

Body

As @ras44, I can create a new files in the docs/ directory on the master branch because I have previously forked tensorforce:

https://github.com/tensorforce/tensorforce/new/master/docs

But if I go to a repo I haven't already forked and attempt to add a new file:

then

then

then

then

Oh no!

I've tried this as @repo-reviews, @rolandrmgservices, and @ras44 on multiple browsers, all with the same effect.

Another example with a very similar workflow that fails is that described in:

https://github.com/up-for-grabs/up-for-grabs.net/tree/gh-pages/_data/projects#using-the-github-web-editor

Any help would be greatly appreciated!

Please upvote if you're affected by this as well. Thanks!