When clicking on any of those links, redirecting to an URL like “root/category/post-name/”, the 404 template is loaded, If you remove the category_template filter, are the links still 404? For categories, your cpt post should appear in the list of posts in that category. So the url is root/category/. When clicking on any of those … Read more
I do not think that there is any sane way to sort this issue with the amount of posts you have except than setting hierarchical to false. Setting hierarchical to true has huge impact on performance and aren’t really meant for use in custom post types. If you do not need a parent/child relationship between … Read more
The $post global is not set on 404 pages, which leads to the error you are getting. You can either check if $post is set or bail if the current page is a 404 page or do all of the above EXAMPLE /** * enqueue scripts used in frontend * */ function sama_enqueue_scripts() { global … Read more
The timing of relevant parts of the process is following: Query executes and fetches posts (or in this case no posts) template_redirect fires Template file is determined from query variables and loaded When you change query variables in template_redirect you change template choice (which you observe), but you still have no posts in query. The … Read more
Try resetting permalink. Go to Settings -> Permalinks and hit save on that page. Try if tags are working now.
The conditional you use to output get_template_part(‘content’, ‘none’); is only triggered if there is no post in the main loop, for example, when a category has no posts in it: if (have_posts()){ while(have_posts()) { the_post(); // If the category has a post and we are on a category page, then show the posts get_template_part(‘content’, ‘archive’); … Read more
You can filter any type of template to override the template hierarchy. In this case the filter is 404_template. We’ll check if the location query var is set, meaning the URL matched the pattern of a location request, but the result was a 404. In that case, we’ll load the 404-taxonomy-location.php template. function wpd_custom_tax_404( $templates … Read more
You mentioned that you disabled all plugins, and changed the theme (I assume you used one of the ‘twenty’ themes, which is what I usually do when trying to find theme/plugin problems). Did you also look at the ‘must use’ plugins (in wp-content/mu-plugins ) (see https://codex.wordpress.org/Must_Use_Plugins ). Maybe a plugin in there is causing problems. … Read more
Sometimes setting your permalinks up and saving them helps solve this kind of problem. Settings-Permalinks-choose your default permalink structure and hit the Save.
Does this WPSE article help? Looking at this article and similar, I’d recommend reading up on the purpose of this feature as you may not want to (fully) disable it.