404 error after publishing a post

I just ran into something similar to this. It had to do with refreshing permalinks. If you go to Settings -> Permalink and just click save see if it fixes your problem. It did for me. In the end I added the following to my functions.php file which updated the permalinks for me. I was using custom post types. Maybe you have a plugin that is doing the same.

add_action('admin_init', 'flush_rewrite_rules');

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