All my plugins and I had 5 of them couldn’t work with previous_post add-on.
This is not something with a specific vendor.
It’s not just about the fact that eventually you couldn’t find a solution to the problem but the fact that your support was really weak that you didn’t even read my questions and you respond every time with excuses which has nothing to do with my questions.
Hope that you will give a better support to your other clients.