On a second look, I managed to reproduce the problem. I was tweaking some options on DevTools then found out...

It looks like when DevTools is registering network data (you can stop that), when you click the checkbox it freezes the DevTools for a while. Mine took about 10s to 30s to unfreeze the DevTools that was stopping the page scripts...

But if you stop the DevTools from registering network data then it return to work like normal.

So, I think it's related to the DevTools frameworks shared between some browsers... Maybe Chromium...

The only solution I see through here is turning that feature off then.