diff --git a/packages/interactivity/src/init.ts b/packages/interactivity/src/init.ts
index b63ffb063044a..9dc8c36a6ef34 100644
--- a/packages/interactivity/src/init.ts
+++ b/packages/interactivity/src/init.ts
@@ -79,6 +79,10 @@ export const init = async () => {
 
 	observedNodeCount = nodes.length;
 	for ( const node of nodes ) {
+		if ( hydratedIslands.has( node ) ) {
+			observedNodeCount--;
+			continue;
+		}
 		intersectionObserver.observe( node );
 	}
 };