fixed unfound node error when Suspense is filtered

packages/react-devtools-shared/src/backend/renderer.js

@@ -1437,6 +1437,9 @@ export function attach(
   }
 
   function recordResetChildren(fiber: Fiber, childSet: Fiber) {
+    if (__DEBUG__) {
+      debug('recordResetChildren()', childSet, fiber);
+    }
     // The frontend only really cares about the displayName, key, and children.
     // The first two don't really change, so we are only concerned with the order of children here.
     // This is trickier than a simple comparison though, since certain types of fibers are filtered.
@@ -1471,6 +1474,23 @@ export function attach(
       nextChildren.push(getFiberID(getPrimaryFiber(fiber)));
     } else {
       let child = fiber.child;
+      const isTimedOutSuspense =
+        fiber.tag === SuspenseComponent && fiber.memoizedState !== null;
+      if (isTimedOutSuspense) {
+        // Special case: if Suspense mounts in a timed-out state,
+        // get the fallback child from the inner fragment,
+        // and skip over the primary child.
+        const primaryChildFragment = fiber.child;
+        const fallbackChildFragment = primaryChildFragment
+          ? primaryChildFragment.sibling
+          : null;
+        const fallbackChild = fallbackChildFragment
+          ? fallbackChildFragment.child
+          : null;
+        if (fallbackChild !== null) {
+          child = fallbackChild;
+        }
+      }
       while (child !== null) {
         findReorderedChildrenRecursively(child, nextChildren);
         child = child.sibling;
@@ -1592,7 +1612,7 @@ export function attach(
       if (nextFallbackChildSet != null) {
         mountFiberRecursively(
           nextFallbackChildSet,
-          nextFiber,
+          shouldIncludeInTree ? nextFiber : parentFiber,
           true,
           traceNearestHostComponentUpdate,
         );