WP confuses post permalink and day permalink when using /%year%/%monthnum%/%postname%/

[Denis-de-Bernardy]

To reproduce, create a new blog, select that permalink structure, and publish an untitled post. View it. Expected: the post shows up. Actual: the day shows up empty — unless, of course, the post's day matches the post's id.

Minor, but annoying. Temporary fix to disable day links entirely:

add_filter('date_rewrite_rules', function($date_rewrite_rules) {
	if (get_option('permalink_structure') == '/%year%/%monthnum%/%postname%/') {
		$date_rewrite_rules = array_filter($date_rewrite_rules, function($rule) {
			return strpos($rule, '&day=') === false;
		});
	}
	return $date_rewrite_rules;
});

Methinks disabling day links should be the default behavior in WP when that structure is chosen.

[SergeyBiryukov]

Duplicate of #5305 and #22592.