the_post_navigation seems to ignore same category filter

You mention a custom post type, are you also using a custom taxonomy? If so you need to specify this taxonomy in your function call:

the_post_navigation(array(
    'prev_text'=>__('previous project: %title'),
    'next_text'=>__('next project: %title'),
    'in_same_term' => true,
    'taxonomy' => 'wpse240053_custom_taxonomy_name',
));

By default the built-in category taxonomy for Posts is used. This requires WP4.4 or later.

Related Posts:

  1. Getting the Next and Previous Posts Titles in the Sidebar?
  2. Adding Post Counts to Menu (Nav) Programmatically?
  3. Navigation link to specific user page
  4. Post Navigation
  5. Restrict post navigation to current sub menu
  6. get_next_post() and get_previous_post() return wrong posts
  7. Disable most recent & view all (TABS) on nav-menu.php
  8. Is it possible to create a form post wordpress custom navigation link?
  9. remove older posts link [closed]
  10. How to create a submenu that will navigate through different posts in the same page
  11. How to Next and Prevous Navigation Buttons on the end of the page with custom image Using Wp Post Navigation Plugin
  12. How to Restrict Previous & Next Post Link to Posts of Same Category?
  13. One menu for frontpage (one pager), and a different menu for posts
  14. Show only one page link in content pagination
  15. Highlight static blog page link in header
  16. Show posts count for Categories and Tags in wp_nav_menu
  17. Restrict the_post-navigation to same category?
  18. Navigate through the posts using keyboard arrows
  19. WordPress pagination and Post Navigation not working on home page
  20. Get current post’s nav menu name (term name)
  21. Add Text Domain To Post Navigation
  22. How to show next/prev link, when it’s not active?
  23. Possible?! A contextually titled back link
  24. Post navigation using date
  25. Blog posts pagination not working
  26. Change URL of previous posts and next posts link in WordPress
  27. get_next_post() not working with future post status
  28. Excluding category from post navigation in WordPress?
  29. Creating a link to the first post in a category
  30. Next / Previous post in a single category
  31. How to add navigation arrows to manually slide through posts?
  32. Can the_post_navigation() be outside of the loop?
  33. Output wp_link_pages as raw url
  34. Page and Posts loading as index page? Not loading the content
  35. Count > 1 Navigation Slider
  36. How do I paginate posts page with $wpdb?
  37. ‘get_previous_post’ in same category returning (!empty) when no previous post in category exists
  38. How can I get the first post THIS SAME CATEGORY?
  39. Show a page counter for pagination
  40. How can I merge a several related posts into one post?
  41. Should we trust the post globals?
  42. how to limit edit_form_after_title hook to page and post edit only?
  43. Add a checkbox to post screen that adds a class to the title
  44. How to cache a shortcode functions output?
  45. How to call function within a page/post, to dynamically generate content?
  46. Load posts dynamically
  47. How do I create a featured post within a custom post type?
  48. How to show posts rank based on custom field value
  49. How do I create Comma Separated list of attached image ids?
  50. Rewriting WordPress core functionallity: Changing the private posts
  51. Post author is changed to admin after his post is modified by admin
  52. How to share same post to multiple site in wordpress?
  53. How can I control multiple editing of wordpress posts?
  54. How to update serialized post meta?
  55. pagination hook doesn’t work with search results
  56. Frontend Post Form Validation
  57. While in “the loop”, detect if a post is the most recent
  58. Edit Post VS Custom Form
  59. Post update RSS notification plugin
  60. Templating of a specific post ID
  61. WP_Query get posts from custom posts by category
  62. List posts in a given category
  63. Adding parent pages to posts
  64. Limit posts per author role (excluding admin) in home page
  65. I want to display custom text widgets for each post in the sidebar?
  66. Append class to posts page
  67. What’s the best way to render Visual Composer in posts, not pages?
  68. Trying to use AngularJS with WordPress without any API
  69. Showing author page if user has no post
  70. post category in wp_insert_post
  71. Fixing paragraph spacing in posts
  72. Customize rel=canonical tag for single blog post
  73. Widget that shows categories with posts numbers
  74. Hide comments and posts posted by other user
  75. How to remove specific tag from multiple posts?
  76. Why this function doesn’t works without the_post?
  77. Why can’t publish posts with too much text?
  78. wordpress add field to post_class
  79. How to store array in usermeta in wordpress
  80. Setting limit to posts or page creation
  81. write a post on user registration
  82. Cannot select certain authors for posts after import
  83. Lightbox on wordpress post page
  84. post/page content
  85. WordPress Architecture as a CMS – Posts & Pages
  86. Getting post and attached image from subdomain
  87. Is there a way to categorize a list posts all at once?
  88. Display “no post” message
  89. Not adding a new post?
  90. On the online version of my blog posts disappear
  91. Thumbnails and images in the blog post are not loading
  92. What’s the best approach to create duplicated pages with paginated posts?
  93. including 404 page in post page
  94. Posts only showing on /localhost/wordpress/ and not on other pages
  95. Posts are printed twice
  96. Custom filter on all post page (admin backend)
  97. Make Show Notes for Individual Podcast Episodes Easy to Find (multiple URL’s?)
  98. How can I count articles retrieved by tags
  99. Creating / Editing a post from within site template
  100. How can I get on the same row two post of different categories?

Leave a Comment