Empty pages impossible to delete

I have an issue on my gitlab wiki. I have create some pages following the tip written when creating a new page “Tip: You can specify the full path for the new file. We will automatically create any missing directories”

My problem is now I can’t delete them, there is no delete button on the page:

Then if create the page by adding a text inside, I can edit (and delete the page), but this create a double entry in the sidebar:

Once I delete the page created, I am back to the state of the screenshot 1.

So whatever I do, I don’t find a way to delete this page