do_action( ‘block_editor_meta_box_hidden_fields’, WP_Post $post )

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   Manzoor Wani (a11n) 6 years ago

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   In save_post hook, to check if the post is published via gutenberg, use this

   add_action( 'block_editor_meta_box_hidden_fields', 'add_gutenberg_hidden_fields', 10, 1 );
   function add_gutenberg_hidden_fields( $post ) {
   
   	echo '<input type="hidden" name="your-field" value="some-value">';
   	echo '<input type="hidden" name="is_gutenberg_post" value="1">';
   }

   then inside save_post callback, use

   if ( isset( $_POST['is_gutenberg_post'] ) ) {
       // came from gutengerg
   }