Paginated comments return a 404 with custom post types

[greenshady]

When using paginated comments with a custom post type, clicking on a comment permalink or a comment page gives a 404.

Steps to reproduce:

• Create a custom post type.
• Set the comments per page under Discussion Settings.
• Create enough comments for pagination on the singular view of a "post".

[dd32]

Confirmed that Custom post types do not receive the comment paging rewrite rules.

Comes down to our nice friend, Rewrite Endpoint bitmasks, Turns out, EP_NONE will not receive comment paging links, as EP_NONE & EP_NONE == 0, which results in it being skipped over..

Obvious solution here is to change custom post url's from EP_NONE to EP_PERMALINK, which should be alright considering that they're Permalinks to objects.

[dd32]

(In [14219]) Change custom post_type default Rewrite endpoint mask to EP_PERMALINK to ensure comment paging rules are added. Removes redundant/non-usable EP_NONE branch. Fixes #13086

[dd32]

This will result in all post types receiving paging rewrite rules regardless of if they support comments. A smarter rewrite generation system is needed and has been discussed elsewhere such as #12779