Not working in the preview mode

When I use preview in the editor, the page navigation does not work. It just goes back to the first page. But a published page works fine.

Also what was the “quick fix” code that you said to install when 4.4 broke it? I wanted to remove that code since you updated the plug-in.

Thanks!

https://www.ads-software.com/plugins/wp-table-of-paginated-contents/