Copy a page - wrong name

Hi. I have a page with text jokes.
How do you create new pages? I just always go under "Pages" , select a category that has already been created and then copy an existing post.
And then change the page title and content. For example, I can quickly create 50 new blonde jokes.
It's easier than using "Add Page", and digging through the categories.
Unfortunately, something is going wrong since the last GRAV update.
The folder name of the copy remains the same in the backend. In the frontend it fits, there the new name appears.
Is this a bug and can it be fixed?

Thanks, I wait for the next update.