It is extremely unlikely for such major part API to be changed in WP release. It is likely that something got broken in your install (possibly unconnected to upgrade) and it needs hands on debug.
First steps would be something like:
- stepping through lower level functions and checking returns, at some point you might get to a more telling
WP_Errorreturn - examining database for data presence/sanity and need of repair
Related Posts:
- Get the the top-level parent of a custom taxonomy term
- get_terms – only top level
- How to only list the child terms of a taxonomy and not their parents?
- Hierarchical taxonomy UI
- Order get_terms using a Custom Field
- Hide the term description on the term edit page, for a given taxonomy
- get_term_by not working when in functions.php
- Can I lock down custom taxonomies on a parent term level, but not a child term?
- Get only the first term by taxonomy
- Exclude specific slug in ‘get_terms’
- wp_insert_term is adding a term that has no name
- get_terms() returns an empty array
- get_terms showing link to category even if all posts are drafts
- Custom Taxonomy Only Showing Top Level Terms in Admin?
- Is it possible to get a Previous/Next Taxonomy term archive URL?
- WP_insert_term how to insert multiple values as taxonomny term?
- Group posts that matches a term in a loop
- Custom taxonomy term as class?
- How to edit/remove a term that’s in multiple taxonomies?
- How to display term description in empty terms archive?
- get_terms custom order
- Limits amount of terms displayed? Is it possible?
- how to create a proper query for getting a list of users with taxonomy related meta key
- How to List Parent Term Links for Custom Taxonomy With & Without Children?
- Generic taxonomy-term template page
- Get direct children of custom taxonomy
- List subcategory on taxonomy term page
- Operations with custom fields values in a loop
- Check if term is in a taxonomy?
- How to insert an array of terms using wp_insert_term?
- Get child product categories from parent product category in WooCommerce
- display taxonomy slug from term ID
- How to show only terms by id or slug on edit-tags.php (custom taxonomy manage page) for a custom taxonomy
- How to use get_the_terms() to display multiple terms?
- Display the description of taxonomy terms
- get_terms adds slaces to the resualt
- List posts of term on term’s admin edit page
- get_term and get_term_by return null or false, even though term exists
- Can I use a Custom Meta Value inside of ‘get_the_terms’?
- one term two taxonomy’s?
- Display only child terms of a specific parent term of a custom taxonomy, for each custom post
- Getting WooCommerce product related child categories
- Same term from custom taxonomy in two different custom post types?
- Some custom taxonomy child terms not showing in admin. Caching problem?
- How do I return all terms from multiple taxonomies?
- Order get_terms() by hierarchy
- Having Issue on Passing Variable into HTML Class Tag
- Returning One custom taxonomy term name
- Displaying Custom Taxonomy without a hyperlink
- Get all terms, including unchecked, or get the terms outside loop
- get_term_link not working
- Query posts using custom taxonomy and selected terms
- Proper use of wp_get_object_terms
- How to support fifteen thousand terms in WordPress?
- Output all terms in a custom taxonomy and add a “active” class only to the ones attached to the current post
- Show template part if part of term
- one post per term taxonomy
- How to check if a post has at least 2 terms from a custom taxonomy attached?
- How can I change the output display of my pagination?
- Can’t get taxonomy ID for each post on archive page
- Hide terms if they aren’t the same as the current term
- Corrupted nav-menu?
- The best way to display taxonomies
- Dynamically set taxonomy term and show admin notice on post save
- Terms change id after importing
- delete term from taxonomy and assign in new one
- Wp_query…a type of term a different div
- How to add a date creation field when a custom taxonomy relationship is created?
- Adding Child Terms Programatically – No Warning but No dice either
- Show related posts on single.php, grouped by taxonomy terms, with Advanced Custom Field post object selected
- Running a function only once when a taxonomy term is changed
- Set post terms by term id
- Displaying my custom taxonomies in a using the_term_list()
- Use wp_list_categories to list parent categories from actual term
- Trash Bin for Categories?
- using wp_insert_term to create custom terms for a custom taxonomy from frontend form,
- is there a way of getting term children that only shows those from two taxonomies
- Display term picture of each post in a loop
- Get Terms of custom Taxonomy of products with certain Product Category
- Problems using get_the_terms in a plugin
- How to add a shortcode function that returns the taxonomy slug of the actual post within the loop
- Tree view wp-admin terms
- Retrieve the child terms by having the parent’s information
- add pagination in wordpress page template
- Order get_terms by count using a custom taxonomy hierarchy
- How to create a non removable taxonomy term?
- WordPress taxonomy terms archive template help
- wp_insert_post not adding taxonomy (using wp_set_object_terms)
- Filter “get_terms” query
- Show message if term slug changed
- generate random slug when adding taxonomy
- Why get_terms() behaves strangely when being called in admin (for use in meta box)?
- qtranslate-x problem with custom term description
- Custom post type term names with ampersand in the term name
- Sorting terms individually for each post
- get_terms returns array starting at 4
- Multiple category lists on one page
- get_the_terms inside save_post gives old terms
- How to delete unused terms?
- Foreach for get_the_terms for hierarchical taxonomy don’t repeat Top Level Terms if contains multiple Second Level Terms