Ticket #53150: 53150.1.diff

src/wp-admin/includes/post.php

@@ -2258 +2258 @@
         <form class="metabox-base-form">
         <?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?>
         </form>
-        <form id="toggle-custom-fields-form" method="post" action="<?php echo esc_attr( admin_url( 'post.php' ) ); ?>">
+        <form id="toggle-custom-fields-form" method="post" action="<?php echo esc_url( admin_url( 'post.php' ) ); ?>">
                 <?php wp_nonce_field( 'toggle-custom-fields', 'toggle-custom-fields-nonce' ); ?>
                 <input type="hidden" name="action" value="toggle-custom-fields" />
         </form>