WordPress at Your Fingertips
action is not described

edit_form_advanced action-hook . WP 1.0

This filter is documented in wp-admin/edit-form-advanced.php

Usage

add_action( 'edit_form_advanced', 'action_function_name_884' );
function action_function_name_884( $post ){
	// action...
}
$post
-

Where the hook is called

the_block_editor_meta_box_post_form_hidden_fields()
edit_form_advanced
wp-admin/includes/post.php 2393
do_action( 'edit_form_advanced', $post );
wp-admin/edit-form-advanced.php 707
do_action( 'edit_form_advanced', $post );

Where in WP core the hook is used WordPress

wp-includes/class-wp-embed.php 45
add_action( 'edit_form_advanced', array( $this, 'maybe_run_ajax_cache' ) );