Post type "Page" ending up being a "Post" post type

I'm having Dutch and German as languages and for Dutch pages works fine but switching to german ends up being a 404.

It does detect that the page is German but it ens up selecting the post table for this language. It only happens when using the slug type: Post name or Default.

Reproduce the issue with Dutch and German pages using the “Post name” and “Default” slug types, then trace how the German language selects the post type or table. Done means German pages resolve successfully instead of returning a 404 and remain associated with the Page post type rather than Post.

Written by the indexing model from the issue text.