ACF custom post type returned intermittent 404s after Rank Math 301 redirects or visiting Permalinks — temporarily fixed only by re-saving ACF taxonomy.
Identified rewrite/flush race with ACF CPT registration, implemented a permanent rewrite flush strategy, and regression-tested redirects + Permalinks visits.
404s gone permanently; documented root cause and prevention. Delivered within the 48hr SLA. 5.0★
We need an experienced WordPress developer to diagnose and resolve intermittent 404 errors with a custom post type created using Advanced Custom Fields (ACF).
# Problem
Custom post type returns 404 errors under specific conditions:
– After adding a 301 redirect in RankMath SEO
– After visiting the Permalinks settings page (no changes or save required)
**Temporary fix:** Visiting the ACF taxonomy page for the CPT and saving (no changes) resolves the 404 until the next trigger.
This indicates a permalink/rewrite rule issue, likely a simple misconfiguration.
# What We Provide
– Admin access to a configured dev environment
– Pre-configured staging environment for testing resets
– Full site context and documentation
# Deliverables
1. Root cause identification
2. Permanent fix implementation
3. Edge case testing (redirects, permalink changes, ACF updates)
4. Technical documentation detailing:
— Root cause
— Solution implemented
— Prevention steps for future configurations
# Timeline
– Solution: 48 hours from contract acceptance
– Documentation: 24 hours after solution approval
Client feedback
“"Duy is excellent to work with. He's responsive and communicates clearly and efficiently. He completed our project quickly, and the solution is elegant and exactly what we were looking for...." See more”