Thank you John for your explanations and for this smart trick (but doesn’t work in my situation). It’s very clear for me how timeout issues work. 🙂
Yes, there’s a lot of fields (around 30 blocks in the screen options) but most of them are empty.
Now, when going back to http://www.example.com/wp-admin/post.php I just get this message:
Warning: in_array() expects parameter 2 to be array, string given in /home/xxxxxx/xxxxxx/wp-content/themes/wplmsblankchildtheme/functions.php on line 179 Fatal error:  operator not supported for strings in /home/xxxxxx/xxxxxx/wp-content/themes/wplmsblankchildtheme/functions.php on line 183
The two lines concerned:
// bail early if the current $post_id is already found in selected post's $value2 if( in_array($post_id, $value2) ) continue; // append the current $post_id to the selected post's 'action-bonne_pratique' value $value2 = $post_id;
I followed this tutorial: https://www.advancedcustomfields.com/resources/bidirectional-relationships/
I don’t have this message for another post (same CPT). ^^
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