When does save_post hook fire on post save/update

save_post is fired at the end of wp_insert_post() which is the core function that’s run whenever a post is inserted or updated (wp_update_post() calls it internally). This includes when the post is updated via the classic editor and the block editor (Gutenberg), as well whenever it’s updated via the REST API. The only reason it wouldn’t fire is if the post was being updated via SQL directly (via a plugin or otherwise), or when only post meta is updated via a function.

So no, this is not the expected behaviour. If your function isn’t firing then it could be interference from another theme or plugin, or it could be an issue with the function itself, but there’s not enough information in the question to say either way.

Related Posts:

  1. Difference Between Filter and Action Hooks?
  2. Which hook should be used to add an action containing a redirect?
  3. How do you use the plugin boilerplate loader class to hook actions and filters?
  4. How Do I Load My Action Earlier Enough?
  5. Does WP fire delete_post when trashed posts are automatically deleted?
  6. What’s the earliest point I can get the queried object ID?
  7. How do I Make a Theme “plugin-ready”?
  8. What’s the difference between hooks, filters and actions? [duplicate]
  9. How to use filter hook ‘post_updated_messages’ in coherence with action hook ‘save_post’
  10. Is it possible to create an action hook using do_action() within add_action()?
  11. How can I hook into existing WordPress Bulk actions?
  12. Define a function outside a class and call the function using action or filter hook
  13. Create a plugin to change the action to which a function is hooked
  14. Modifying values with add_action to be sent to db
  15. Woocommerce – Hide a Column in Cart Table
  16. Hook to get image filename when it is uploaded
  17. Which are the hooks run before/after when a category’s deletion?
  18. Should action callbacks start with a verb?
  19. Execute Hook on the footer or header after activating a plugin
  20. Namespaced action and filter tags
  21. Prefixing plugin hooks (actions/filters) with a wrapper class or functions
  22. I have 2 plugins using the same wp_login action hook and one is not working
  23. How dynamic action login_form_{action} is working
  24. What action hook can I use to add a JavaScript to a page post using a theme template that is not including get_header() nor get_footer()?
  25. How to get all queries’s results after they have executed?
  26. Bug: Post needs to be updated twice when adding action for save_post hook
  27. Hook add_attachment error
  28. Call to undefined function is_home() or any conditional tags
  29. How to find list of all functions bind to a particular hook from my plugin?
  30. Can I Hook Into the TinyMCE Insert/Edit Link Button to Use Shortlink For Post?
  31. Using init hook for register_taxonomy is causing invalid_taxonomy in wp_insert_term()
  32. Action / Hook when a new plugin is added
  33. apply_filters() and call_user_func() to define and call a function outside a class
  34. WordPress Plugin Boilerplate – add actions and/or filters based on user’s role
  35. remove different admin menu for specific users
  36. add_option_{$option} action hook not being called
  37. Does WordPress have something like timer hook?
  38. How can I set a dynamic value for post_updated_messages based on return value of post_updated?
  39. Insert plugin html content to a specific spot in the frontpage
  40. Apply function on all action hooks?
  41. Ninja Forms: Front-End Forms, Post ID?
  42. How many times will this code run? (or, how rich is grandma?)
  43. add_action hook for completely new post?
  44. WordPress Hook for user register
  45. Which action for triggering cron “wp”or “init”?
  46. Using filters and actions for plugin API?
  47. Explanation of the “posts_join” and “posts_fields” filter hooks?
  48. Actions or filters fired when data is saved in a custom table
  49. In a plugin, why is add_action(‘init’) not executed before the plugin is activated?
  50. Call activation hook multiple times
  51. How to check if certain plugin exists and in expected version
  52. Is it possible to modify the media library admin screen?
  53. What function to hook for changes made in status and visibility of a post
  54. Order of Operation for these three hooks
  55. save_post hook not triggered in WP v3.6.1
  56. How to redirect to action on custom page within admin section
  57. What are the benefit in adding hook in the init() hook?
  58. How to display a message about updates in the plugin list
  59. How to run an add_action hook for specific page
  60. Which action is triggered when a theme was modified?
  61. wp_transition_post_status does not change the status of the post
  62. How to delete an user including data from custom database tables
  63. action hook wp_head higher priority as all other plugins/hooks
  64. What filter should I use to insert a button inside on Media>Add New
  65. Issue plugin commands in admin settings page
  66. My plugin class doesn’t work! [closed]
  67. add_action not calling back to function
  68. How to use a hook to override an update_post_meta call in a plugin?
  69. External Authentication, session_tokens not destroyed on logout
  70. correct way to call javascript into hook function
  71. How to get all of the activate_plugin action parameters?
  72. Send push when new post is published in a certain category
  73. Force HTTPS 301 redirect with hook
  74. use of do_action() without any functions attached
  75. Plugin uninstall function is not working
  76. Odd map_meta_cap $args on post edit — sometimes integer, sometimes string
  77. How can I create a custom plugin that allows anonymous users to signup without registering?
  78. Bind a function with its own argument to show something dynamically after every content
  79. A question about add_action()
  80. What’s the hook for filtering every texts of site?
  81. Associate multiple email addresses with the same user account, so they can log in with either
  82. Update variable value via add_filter
  83. Custom filter not working
  84. hook update_option/updated_option empty $old_value and $value
  85. Configure WordPress to Generate Scheme-less Relative URLs
  86. How to do admin ajax request in a plugin for rest api
  87. ajax-action.php can’t find added action
  88. Problem in plugin debuging in wordpress
  89. OOP development and hooks
  90. Add_action not calling callback function
  91. how to retrieve post_id under woocommerce_add_to_cart_validation hook?
  92. Function not working on any file other than the main plugin file
  93. Multi hook deploiement
  94. Can I use a hook other than ‘init’ to handle form submissions?
  95. action callback, for action dispatched as reported by hook sniffer, not called
  96. woocommerce single product page hook not working
  97. Plugin Hook: Get posts
  98. What is the use of wp_schedule_event hook?
  99. Sending Parameter Failed
  100. get_term_by() returning null on plugin