Make it so the changes in block-templates.php is no longer required

lib/compat/wordpress-6.6/compat.php

@@ -30,3 +30,55 @@ function gutenberg_change_patterns_link_and_remove_template_parts_submenu_item()
 	}
 }
 add_action( 'admin_init', 'gutenberg_change_patterns_link_and_remove_template_parts_submenu_item' );
+
+/**
+ * Given that we can't modify `locate_block_template()` in `wp-includes` to call `gutenberg_get_block_templates()` instead of `get_block_templates()` we need to filter the results and return the correct template.
+ *
+ * @global string $_wp_current_template_content
+ * @global int $_wp_current_template_id
+ */
+$template_filters = array(
+	'404_template',
+	'archive_template',
+	'attachment_template',
+	'author_template',
+	'category_template',
+	'date_template',
+	'embed_template',
+	'frontpage_template',
+	'home_template',
+	'index_template',
+	'page_template',
+	'paged_template',
+	'privacypolicy_template',
+	'search_template',
+	'single_template',
+	'singular_template',
+	'tag_template',
+	'taxonomy_template',
+);
+foreach ( $template_filters as $template_filter ) {
+	add_filter(
+		$template_filter,
+		function (
+			$template,
+			$type,
+			$templates
+		) {
+			global $_wp_current_template_content, $_wp_current_template_id;
+			foreach ( $templates as $template_slug ) {
+				$located_template = WP_Block_Templates_Registry::get_instance()->get_by_slug( 'wp_template', $template_slug );
+				if ( isset( $located_template ) ) {
+					$_wp_current_template_id      = $located_template->id;
+					$_wp_current_template_content = $located_template->content;
+
+					return ABSPATH . WPINC . '/template-canvas.php';
+				}
+			}
+
+			return $template;
+		},
+		10,
+		3
+	);
+}