WordPress fix Cannot set number after ‘page’ as a slug

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Cannot set number after ‘page’ as a slug, by Yu ONODA

Hello, I cannot set number after ‘page’ as a slug. Is this default setting or bug?

I’m trying to post articles which slug is like ‘page1’ as static page.
But it is converted to ‘page1-2’ after saving.

I do not have any page which slug is ‘page’ and number on WP-Post database including trash and draft. And I also have tried on no plugin environment, but same incident happen.

Does someone know about this? please let me know.

Cannot set number after ‘page’ as a slug