I use the following bookmarklet to fix issues like this. It's similar to the browser addon discussed in sibling comments, but without installing a browser addon

I use the following bookmarklet to fix issues like this. It's similar to the browser addon discussed in sibling comments, but without installing a browser addon. Simply create a bookmark named e.g. "Don't mess with paste" with the following URL: javascript:void(document.documentElement.addEventListener('keydown',e=>e.keyCode==9&&e.stopPropagation(),true),document.documentElement.addEventListener('copy',e=>e.stopPropagation(),true),document.documentElement.addEventListener('paste',e=>e.stopPropagation(),true))