WordPress Custom Post Types: Fixing 404 Errors, Pagination, and ACF Issues

WordPress Custom Post Types: When They Break

Custom Post Types power complex WordPress sites — from portfolios to course platforms. But they can be the source of frustrating bugs.

The Dreaded 404 on CPT Pages

In Resolve Intermittent ACF 404 Errors, CPT pages were randomly returning 404s. The root cause was a permalink flush issue.

Sorting and Pagination

Fix Sorting & Pagination of Custom Post Type — the archive page showed incorrect results because the main query conflicted with a custom WP_Query.

PHP Widget Integration

In Fix PHP Widget, a custom widget displaying CPT data was crashing because it wasn’t checking for empty results.

Best Practices

• Always flush permalinks after registering CPTs
• Use pre_get_posts for archive modifications
• Add proper has_archive and rewrite rules
• Test with the REST API to verify data structure

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