y( $result ) ||
				! array_is_list( $result ) ||
				! str_starts_with( trim( $inner_content ), '<' ) ||
				! str_ends_with( trim( $inner_content ), '>' )
			) {
				array_pop( $tag_stack );
				return;
			}

			// Extracts the namespace from the directive attribute value.
			$namespace_value         = end( $this->namespace_stack );
			list( $namespace_value ) = is_string( $attribute_value ) && ! empty( $attribute_value )
				? $this->extract_directive_value( $attribute_value, $namespace_value )
				: array( $namespace_value, null );

			// Processes the inner content for each item of the array.
			$processed_content = '';
			foreach ( $result as $item ) {
				// Creates a new context that includes the current item of the array.
				$this->context_stack[] = array_replace_recursive(
					end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
					array( $namespace_value => array( $item_name => $item ) )
				);

				// Processes the inner content with the new context.
				$processed_item = $this->_process_directives( $inner_content );

				if ( null === $processed_item ) {
					// If the HTML is unbalanced, stop processing it.
					array_pop( $this->context_stack );
					return;
				}

				// Adds the `data-wp-each-child` to each top-level tag.
				$i = new WP_Interactivity_API_Directives_Processor( $processed_item );
				while ( $i->next_tag() ) {
					$i->set_attribute( 'data-wp-each-child', true );
					$i->next_balanced_tag_closer_tag();
				}
				$processed_content .= $i->get_updated_html();

				// Removes the current context from the stack.
				array_pop( $this->context_stack );
			}

			// Appends the processed content after the tag closer of the template.
			$p->append_content_after_template_tag_closer( $processed_content );

			// Pops the last tag because it skipped the closing tag of the template tag.
			array_pop( $tag_stack );
		}
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WP_Interactivity_API' not found in /home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/interactivity-api/interactivity-api.php:25
Stack trace:
#0 /home/kordian1/domains/ostrabrama.pl/public_html/wp-settings.php(405): wp_interactivity()
#1 /home/kordian1/domains/ostrabrama.pl/public_html/wp-config.php(81): require_once('/home/kordian1/...')
#2 /home/kordian1/domains/ostrabrama.pl/public_html/wp-load.php(50): require_once('/home/kordian1/...')
#3 /home/kordian1/domains/ostrabrama.pl/public_html/wp-blog-header.php(13): require_once('/home/kordian1/...')
#4 /home/kordian1/domains/ostrabrama.pl/public_html/index.php(17): require('/home/kordian1/...')
#5 {main}
  thrown in <b>/home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/interactivity-api/interactivity-api.php</b> on line <b>25</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/l10n.php:856
Stack trace:
#0 /home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/l10n.php(959): load_textdomain('default', '/home/kordian1/...', 'pl_PL')
#1 /home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/kordian1/domains/ostrabrama.pl/public_html/wp-includes/l10n.php</b> on line <b>856</b><br />