fix(editor): Preserve paired item data in pinned data (#21417)

Co-authored-by: Claude <noreply@anthropic.com>

packages/frontend/editor-ui/src/app/stores/workflows.store.ts

@@ -1046,11 +1046,19 @@ export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, () => {
 			delete nodeMetadata.value[nodeName].pinnedDataLastRemovedAt;
 		}
 
-		const storedPinData = payload.data.map((item) =>
-			isJsonKeyObject(item)
-				? { json: item.json, ...(item.binary && { binary: item.binary }) }
-				: { json: item },
-		);
+		const storedPinData = payload.data.map((item) => {
+			// Store only essential properties: json, binary, and pairedItem
+			// Exclude runtime properties (error, metadata, evaluationData, etc.)
+			if (isJsonKeyObject(item)) {
+				const { json, binary, pairedItem } = item;
+				return {
+					json,
+					...(binary && { binary }),
+					...(pairedItem !== undefined && { pairedItem }),
+				};
+			}
+			return { json: item };
+		});
 
 		workflow.value.pinData[nodeName] = storedPinData;
 		workflowObject.value.setPinData(workflow.value.pinData);

packages/workflow/src/workflow-data-proxy.ts

@@ -794,19 +794,6 @@ export class WorkflowDataProxy {
 			});
 		};
 
-		const createInvalidPairedItemError = ({ nodeName }: { nodeName: string }) => {
-			return createExpressionError("Can't get data for expression", {
-				messageTemplate: 'Expression info invalid',
-				functionality: 'pairedItem',
-				functionOverrides: {
-					message: "Can't get data",
-				},
-				nodeCause: nodeName,
-				descriptionKey: 'pairedItemInvalidInfo',
-				type: 'paired_item_invalid_info',
-			});
-		};
-
 		const createMissingPairedItemError = (
 			nodeCause: string,
 			usedMethodName: PairedItemMethod = PAIRED_ITEM_METHOD.PAIRED_ITEM,
@@ -962,7 +949,7 @@ export class WorkflowDataProxy {
 			// Done: reached the destination node in the ancestry chain
 			if (sourceData.previousNode === destinationNodeName) {
 				if (pairedItem.item >= outputData.length) {
-					throw createInvalidPairedItemError({ nodeName: sourceData.previousNode });
+					throw createMissingPairedItemError(sourceData.previousNode, usedMethodName);
 				}
 
 				return item;

packages/workflow/test/workflow-data-proxy.test.ts

@@ -350,8 +350,9 @@ describe('WorkflowDataProxy', () => {
 			} catch (error) {
 				expect(error).toBeInstanceOf(ExpressionError);
 				const exprError = error as ExpressionError;
-				expect(exprError.message).toEqual("Can't get data for expression");
-				expect(exprError.context.type).toEqual('paired_item_invalid_info');
+				expect(exprError.message).toContain('Paired item data for item from node');
+				expect(exprError.message).toContain('Edit Fields');
+				expect(exprError.context.type).toEqual('paired_item_no_info');
 			}
 		});
 	});