Custom taxonomy and custom post does not work with Polylang

I am using Polylang 2.9 with WordPress 5.5.3.
In the setup of polylang my custom taxonomies and custom post types are marked.
If the polylang plugin is activated, it is not possible to add a new custom taxonomy in the editor page of my custom post. It will not appear on the site of the post. In the list of the custom taxonomies does it appear, if I try to enter it 2 times, but it cannot be translated.
If I try to enter a new taxonomy in the custom taxonomy list, it works, but cannot be translated and will not appear as a taxonomy in the post editor.
If I deactivate polylang, all new taxonomies can be entered without any problem and can be assigned to posts.
As my custom taxonomies and custom posts are marked in the setup dialogue, I have no idea what I can do … I think, it is an error of polylang. Please help

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