Unable to select/add categories while creating new posts

Dear support team,

strange things happens on my site. While trying to create new posts I cannot select or add new categories. I’ve tried by deactivating all plugins except woocommerce and still running into the same problem. WP Version 5.5.1 in use.

Editor > https://www.screencast.com/t/aHmkiNrvle9k

The only workaround is to add/switch the category while using the quick editor mode in the backend. Then I am able to set the category.

Quick edit mode> https://www.screencast.com/t/JKRGe0Sw

Do you have any answers, why this happens or solution to solve?

Best regards, Alex

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