With the latest WP Update it seems to be a bug in posts categories. Every posts says, in the frontend, that is uncategorized. Even if you go to every post it says “-” in the category column.

BUT category filters are working, and if you go to categories in backoffice you’ll see posts correctly counted, and if you go to the category in frontend you’ll see the posts. Even if you try to edit the post you’ll see that the category is correctly checked.

But for some reasons in backoffice (in the posts section) and in the post itself in the frontend, it says is uncategorized.

How can we solve this?

Thank you in advance.