Hi @t0t0r0555 hello and thanks for using the plugin! I have typically only been releasing a new version of the plugin every ~2 versions of Core, due to work and personal life commitments. Also, Core typically is not changing much (if anything) related to how this plugin functions – so just because a new release is not out asserting compatibility with a more recent release does not mean it does NOT work with a newer release. As far as I know, the latest version of the plugin works well on 5.9 as well as 6.0.
That said, I am looking to release a new update to the plugin in the next week or two so you can expect a new version soon tagged up to 6.0. Cheers!