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Preview with Custom Post Type Not Working

At this point I have tried everything I know to fix the issue.

Issue: preview only works right after a custom posts is loaded or updated. If you make any changes or hit preview twice without updating the preview 404s. Pages and blog post do not 404 the previews.

We were using the ACF and CPUI plugins and roots theme. I have turned off all the plugins, switch to the 2014 theme, add the CPT manually, and Update WP core.

We have a lot of Custom post types in our site and rebuilding would be a huge pain.

Has anyone dealt with this issues? Anything helps.