fix(core): Fix pairedItem for alwaysOutputData & multi identical resolve (#6405)

packages/workflow/src/Interfaces.ts

@@ -1763,6 +1763,23 @@ export interface IWorkflowSettings {
 	executionTimeout?: number;
 }
 
+export interface WorkflowTestData {
+	description: string;
+	input: {
+		workflowData: {
+			nodes: INode[];
+			connections: IConnections;
+			settings?: IWorkflowSettings;
+		};
+	};
+	output: {
+		nodeExecutionOrder?: string[];
+		nodeData: {
+			[key: string]: any[][];
+		};
+	};
+}
+
 export type LogTypes = 'debug' | 'verbose' | 'info' | 'warn' | 'error';
 
 export interface ILogger {

packages/workflow/src/WorkflowDataProxy.ts

@@ -806,6 +806,13 @@ export class WorkflowDataProxy {
 						.filter((result) => result !== null);
 
 					if (results.length !== 1) {
+						// Check if the results are all the same
+						const firstResult = results[0];
+						if (results.every((result) => result === firstResult)) {
+							// All results are the same so return the first one
+							return firstResult;
+						}
+
 						throw createExpressionError('Invalid expression', {
 							messageTemplate: 'Invalid expression under ‘%%PARAMETER%%’',
 							functionality: 'pairedItem',