An excluded 'ghost' page is crashing my permalink

I am a SEO intern, and I'm having a problem with a wordpress page that I have to optimize.
So, I would like to make a better site structure, but when I am going to configure the permalink of the ascending page in the page attribute, the site crash.

Here is the video of the crash https://drive.google.com/file/d/1Lbth0xFeh_GIqDyjpWP0FfU3tV6_WT7v/view

And the ascending page that appears /Wolf/ doesn't exist in any of the trash or drafts of the wordpress blog

Thanks, this is my first question