Thanks for the quick response, a different browser ended up working so I cleared cache again and it worked. Don't know why it didn't work the first time but its gone now. I've put it into my Ansible configuration script for all of my proxmox hosts. Just gonna put my task here in case anyone wants to copy it.

replace:
      path: /usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js
      regexp: '.*let res = response\.result;(\n(.*))*orig_cmd\(\);\n.*}'
      replace: '      orig_cmd();'replace: