I hit the homepage. I click on Figma. That all works fine. Figma page loads, I browse the info on it. I click back, it takes me to the main page again. I click back to leave the site and go back to HN, it prevents that action. I hit back again, same result; I can no longer use the back button to navigate backwards.

Yeah it broke the back button, for one reason or another. I'm 100% certain I can't traverse backwards using back.

Just tested it again.

Edit: tested it in Chrome 89.0.4389.114 (on Windows 10). Same problem.

I can replicate something similar if I visit the site via http and not https, because there is an application level re-direct.

I have pushed an update to solve the navigation issue.

It also breaks on iOS Safari

I have pushed an update to solve the navigation issue.

Yes it does happen to me too