Unfortunately I’ve been struggling with the plugin for quite some time, something that struck me again when I reread my archive. At the end of December 2020 I already ran into the same problems that I still have. In May 2021 I once again expressed my frustration in a blog post, and luckily both Ton and Jan were kind enough to steer me towards possible solutions. I know that Ton is now busy (or ready?) to phase out Post Kinds. And this plugin from Jan also offers possibilities.
Google translation.