Child post redirects to parent

I modified the plugin code to work with CPTs. You can view my forked repository here: https://github.com/akshatkedia/allow-numeric-stubs

WordPress is now allowing numeric slugs for CPTs but when I visit a child post with a numeric slug it redirects to the parent post automatically. So for example I have a Programmes CPT. There is a parent program with the slug: programmes/city-in-visible/ and a child program with the slug: programmes/city-in-visible/2009/

Visiting programmes/city-in-visible/2009/ redirects to programmes/city-in-visible/

Can you please suggest a solution for this?

Start by reproducing the redirect with the Programmes CPT example, using the parent slug programmes/city-in-visible/ and child slug programmes/city-in-visible/2009/. Then inspect the plugin code in the linked fork to identify where numeric stubs and child-post URL resolution are handled. Done means visiting the child URL no longer redirects to its parent while the existing numeric-slug behavior remains intact.

Written by the indexing model from the issue text.