Plugin Updates

wp/wp-includes/blocks/footnotes.php

@@ -68,18 +68,6 @@ function render_block_core_footnotes( $attributes, $content, $block ) {
  * @since 6.3.0
  */
 function register_block_core_footnotes() {
-	foreach ( array( 'post', 'page' ) as $post_type ) {
-		register_post_meta(
-			$post_type,
-			'footnotes',
-			array(
-				'show_in_rest'      => true,
-				'single'            => true,
-				'type'              => 'string',
-				'revisions_enabled' => true,
-			)
-		);
-	}
 	register_block_type_from_metadata(
 		__DIR__ . '/footnotes',
 		array(
@@ -89,6 +77,40 @@ function register_block_core_footnotes() {
 }
 add_action( 'init', 'register_block_core_footnotes' );
 
+
+/**
+ * Registers the footnotes meta field required for footnotes to work.
+ *
+ * @since 6.5.0
+ */
+function register_block_core_footnotes_post_meta() {
+	$post_types = get_post_types( array( 'show_in_rest' => true ) );
+	foreach ( $post_types as $post_type ) {
+		// Only register the meta field if the post type supports the editor, custom fields, and revisions.
+		if (
+			post_type_supports( $post_type, 'editor' ) &&
+			post_type_supports( $post_type, 'custom-fields' ) &&
+			post_type_supports( $post_type, 'revisions' )
+		) {
+			register_post_meta(
+				$post_type,
+				'footnotes',
+				array(
+					'show_in_rest'      => true,
+					'single'            => true,
+					'type'              => 'string',
+					'revisions_enabled' => true,
+				)
+			);
+		}
+	}
+}
+/*
+ * Most post types are registered at priority 10, so use priority 20 here in
+ * order to catch them.
+*/
+add_action( 'init', 'register_block_core_footnotes_post_meta', 20 );
+
 /**
  * Adds the footnotes field to the revisions display.
  *