In case of infinite scroll while trying to add needed attributes to variable products,
just don’t panic and replace current select2.js file with fixed one.
Follow the link below to download mentioned file,unzip it and implement replacement within the folder
straight on your server wp-content/plugins/contentbuilder/assets/3rd-party/jquery select2
https://www.dropbox.com/s/7mtoeyt6pjygclw/select2.zip?dl=0
And don’t forget to refersh your site in browser with ctrl+shift+R