Bad product managers sometimes think it’s a good idea to prevent you from pasting data into a web form “for security”. This is a particularly popular trick on websites where you enter payment account numbers.
Here’s a quick fix that seems to work. Supplied by Gemini but no doubt well known.
document.addEventListener('paste', (e) => e.stopImmediatePropagation(), true);
This basically overrides any event handlers for paste that the page code might have done. Not a good idea in general but it does seem to fix pasting into a box.