fix(core): Resolve $().item expressions in partial executions (#27338)

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

@@ -1229,6 +1229,24 @@ export class WorkflowDataProxy {
 										if (pinnedData) {
 											return that.returnExecutionData(pinnedData[itemIndex], resolveFullItem);
 										}
+										// The active node has not run yet (e.g. partial execution),
+										// so paired item resolution cannot trace through the chain.
+										// Fall back to reading directly from the referenced node's
+										// run data, which is what first()/last()/all() do.
+										const nodeRunData = that.getNodeExecutionOrPinnedData({
+											nodeName,
+										});
+										if (nodeRunData.length) {
+											// In the UI preview itemIndex is always 0, but guard against
+											// out-of-bounds access in case that assumption ever changes.
+											if (itemIndex >= nodeRunData.length) {
+												throw createExpressionError(
+													`"${nodeName}" node has ${nodeRunData.length} item(s) but expression references item ${itemIndex}`,
+													{ itemIndex },
+												);
+											}
+											return that.returnExecutionData(nodeRunData[itemIndex], resolveFullItem);
+										}
 									}
 
 									const executionData = that.connectionInputData;

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

@@ -1907,4 +1907,141 @@ describe('WorkflowDataProxy', () => {
 			expect(result).not.toHaveProperty('params');
 		});
 	});
+
+	describe('Partial execution: $() referencing executed node from unexecuted active node', () => {
+		// Scenario: Reference → Edit → NoOp → Edit Fields
+		// Only Reference and Edit have been executed (partial execution).
+		// Edit Fields (active, unexecuted) uses $('Edit').item.json.test
+		// "Edit" has data in runData, so the expression should resolve.
+		const workflowData: IWorkflowBase = {
+			id: '123',
+			name: 'partial execution test',
+			nodes: [
+				{
+					id: 'node1',
+					name: 'Reference',
+					type: 'n8n-nodes-base.manualTrigger',
+					typeVersion: 1,
+					position: [256, 16] as [number, number],
+					parameters: {},
+				},
+				{
+					id: 'node2',
+					name: 'Edit',
+					type: 'n8n-nodes-base.set',
+					typeVersion: 3.4,
+					position: [544, 16] as [number, number],
+					parameters: {
+						assignments: {
+							assignments: [
+								{
+									id: 'e8d2af0b-147a-4b0d-a106-5ed5a5b753e4',
+									name: 'test',
+									value: '={{ 1111 }}',
+									type: 'string',
+								},
+							],
+						},
+						options: {},
+					},
+				},
+				{
+					id: 'node3',
+					name: 'NoOp',
+					type: 'n8n-nodes-base.noOp',
+					typeVersion: 1,
+					position: [832, 32] as [number, number],
+					parameters: {},
+				},
+				{
+					id: 'node4',
+					name: 'Edit Fields',
+					type: 'n8n-nodes-base.set',
+					typeVersion: 3.4,
+					position: [1136, 0] as [number, number],
+					parameters: {},
+				},
+			],
+			connections: {
+				Reference: {
+					main: [[{ node: 'Edit', type: NodeConnectionTypes.Main, index: 0 }]],
+				},
+				Edit: {
+					main: [[{ node: 'NoOp', type: NodeConnectionTypes.Main, index: 0 }]],
+				},
+				NoOp: {
+					main: [[{ node: 'Edit Fields', type: NodeConnectionTypes.Main, index: 0 }]],
+				},
+			},
+			active: false,
+			activeVersionId: null,
+			isArchived: false,
+			createdAt: new Date(),
+			updatedAt: new Date(),
+		};
+
+		// Exact run data from a real partial execution (only Reference and Edit ran)
+		const run: IRun = {
+			data: createRunExecutionData({
+				resultData: {
+					runData: {
+						Reference: [
+							{
+								startTime: 1774006769741,
+								executionTime: 1,
+								executionIndex: 0,
+								executionStatus: 'success',
+								source: [],
+								data: {
+									main: [[{ json: {}, pairedItem: { item: 0 } }]],
+								},
+							},
+						],
+						Edit: [
+							{
+								startTime: 1774006769743,
+								executionTime: 8,
+								executionIndex: 1,
+								executionStatus: 'success',
+								source: [
+									{
+										previousNode: 'Reference',
+										previousNodeOutput: 0,
+										previousNodeRun: 0,
+									},
+								],
+								data: {
+									main: [[{ json: { test: '1111' }, pairedItem: { item: 0 } }]],
+								},
+							},
+						],
+						// NoOp and Edit Fields have NOT been executed
+					},
+				},
+			}),
+			mode: 'manual',
+			startedAt: new Date(),
+			status: 'success',
+			storedAt: 'db',
+		};
+
+		test('$("Edit").first() should return data when referenced node was executed', () => {
+			const proxy = getProxyFromFixture(workflowData, run, 'Edit Fields', 'manual');
+			expect(proxy.$('Edit').first().json.test).toBe('1111');
+		});
+
+		test('$("Edit").isExecuted should return true', () => {
+			const proxy = getProxyFromFixture(workflowData, run, 'Edit Fields', 'manual');
+			expect(proxy.$('Edit').isExecuted).toBe(true);
+		});
+
+		test('$("Edit").item.json.test should resolve when the referenced node was executed', () => {
+			// .item uses paired item resolution which requires connectionInputData
+			// (the active node's input). In a partial execution the active node hasn't
+			// run so connectionInputData is empty, but the referenced node "Edit" has
+			// data in runData. The fix falls back to reading from runData directly.
+			const proxy = getProxyFromFixture(workflowData, run, 'Edit Fields', 'manual');
+			expect(proxy.$('Edit').item.json.test).toBe('1111');
+		});
+	});
 });