Fix suspense diffing (#2789)

* Fix suspense placeholders after creating a node
* add nested suspense client side core test
* fix resolve suspense

packages/core/src/runtime.rs

@@ -243,7 +243,7 @@ impl Runtime {
         // If this is not a suspended scope, and we are under a frozen context, then we should
         let scopes = self.scope_states.borrow();
         let scope = &scopes[scope_id.0].as_ref().unwrap();
-        !matches!(scope.suspense_location(), SuspenseLocation::UnderSuspense(suspense) if suspense.has_suspended_tasks())
+        !matches!(scope.suspense_location(), SuspenseLocation::UnderSuspense(suspense) if suspense.is_suspended())
     }
 }