fix(core): Opt-out from optimizations if $item is used (#12036)

packages/@n8n/task-runner/src/js-task-runner/built-ins-parser/built-ins-parser.ts

@@ -125,6 +125,11 @@ export class BuiltInsParser {
 	private visitIdentifier = (node: Identifier, state: BuiltInsParserState) => {
 		if (node.name === '$env') {
 			state.markEnvAsNeeded();
+		} else if (node.name === '$item') {
+			// $item is legacy syntax that is basically an alias for WorkflowDataProxy
+			// and allows accessing any data. We need to support it for backwards
+			// compatibility, but we're not gonna implement any optimizations
+			state.markNeedsAllNodes();
 		} else if (
 			node.name === '$input' ||
 			node.name === '$json' ||