diff --git a/src/wp-includes/interactivity-api/class-wp-interactivity-api.php b/src/wp-includes/interactivity-api/class-wp-interactivity-api.php
index 0ee2ba8eff20c..2f3dd978baa50 100644
--- a/src/wp-includes/interactivity-api/class-wp-interactivity-api.php
+++ b/src/wp-includes/interactivity-api/class-wp-interactivity-api.php
@@ -747,7 +747,15 @@ private function evaluate( $entry ) {
 		}
 
 		// Returns the opposite if it contains a negation operator (!).
-		return $should_negate_value ? ! $current : $current;
+		// Uses JavaScript-compatible truthiness rules to ensure server and client
+		// rendering agree. PHP and JavaScript differ on two values:
+		// - [] (empty array): falsy in PHP, truthy in JavaScript.
+		// - '0' (string zero): falsy in PHP, truthy in JavaScript.
+		if ( $should_negate_value ) {
+			$is_truthy = is_array( $current ) || '0' === $current ? true : (bool) $current;
+			return ! $is_truthy;
+		}
+		return $current;
 	}
 
 	/**