Hitting the # key in a thread opens the popup that enables you tou enter the post number to jump to.
In some Browsers (could only see it in Safari 13.1.1 on macOS 10.15.5) the # character is put into the form field that opens in the popup. In Chrome 83 on macOS that doesn’t happen and I can instantly enter the post number.
Is this a known bug or a browser limitation?