Hah if your Github repo name is at the right length, you'll get that bug with the fork pop-up window.

[0] https://i.imgur.com/dS5acnx.gifv The gif doesn't have enough fps. IRL the animation is about 10x faster than that so there's no time to click the username.

Reported it but the support agent couldn't reproduce ¯\_(ツ)_/¯