diff --git a/src/components/__tests__/OutputNode.test.tsx b/src/components/__tests__/OutputNode.test.tsx
index 6a70a6b7..e6a3b664 100644
--- a/src/components/__tests__/OutputNode.test.tsx
+++ b/src/components/__tests__/OutputNode.test.tsx
@@ -69,6 +69,7 @@ describe("OutputNode", () => {
         regenerateNode: vi.fn(),
         edges: [],
         isRunning: false,
+        runningNodeIds: new Set<string>(),
         currentNodeIds: [],
         groups: {},
         nodes: [],
diff --git a/src/store/workflowStore.ts b/src/store/workflowStore.ts
index 81115520..723a52c5 100644
--- a/src/store/workflowStore.ts
+++ b/src/store/workflowStore.ts
@@ -2348,12 +2348,11 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
     if (nodesToGroup.length === 0) return "";
     pushUndoCheckpoint(get, set);
 
-    // Calculate bounding box of selected nodes
+    // Calculate bounding box from persisted style sizes.
     const nodeById = new Map(nodes.map((node) => [node.id, node]));
     const absolutePositionByNodeId = new Map<string, XYPosition>();
     let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
     nodesToGroup.forEach((node) => {
-      // Use measured dimensions (actual rendered size) first, then style, then type-specific defaults
       const { width, height } = getNodeSize(node);
       const absolutePosition = getAbsoluteNodePosition(node, nodeById);
       absolutePositionByNodeId.set(node.id, absolutePosition);