Clear Update flag for unchanged trees in the beginning of the commit phase

packages/react-reconciler/src/ReactFiberApplyGesture.js

@@ -631,6 +631,12 @@ function recursivelyInsertClonesFromExistingTree(
         const viewTransitionState: ViewTransitionState = child.stateNode;
         // TODO: If this was already cloned by a previous pass we can reuse those clones.
         viewTransitionState.clones = null;
+        // "Existing" view transitions are in subtrees that didn't update so
+        // this is a "current". We normally clear this upon rerendering
+        // but we use this flag to track changes from layout in the commit.
+        // So we need it to be cleared before we do that.
+        // TODO: Use some other temporary state to track this.
+        child.flags &= ~Update;
         let nextPhase;
         if (visitPhase === CLONE_EXIT) {
           // This was an Enter of a ViewTransition. We now move onto unhiding the inner

packages/react-reconciler/src/ReactFiberCommitViewTransitions.js

@@ -510,6 +510,12 @@ export function commitNestedViewTransitions(changedParent: Fiber): void {
         props.default,
         props.update,
       );
+      // "Nested" view transitions are in subtrees that didn't update so
+      // this is a "current". We normally clear this upon rerendering
+      // but we use this flag to track changes from layout in the commit.
+      // So we need it to be cleared before we do that.
+      // TODO: Use some other temporary state to track this.
+      child.flags &= ~Update;
       if (className !== 'none') {
         applyViewTransitionToHostInstances(
           child.child,