diff --git a/src/vs/base/common/lifecycle.ts b/src/vs/base/common/lifecycle.ts
index c4fec6d89ca0bdff37efcbcfc6f554340764caff..406a9c801d4a2a5cc9d1107ca8355d83d22114c8 100644
--- a/src/vs/base/common/lifecycle.ts
+++ b/src/vs/base/common/lifecycle.ts
@@ -66,7 +66,7 @@ export function dispose<T extends IDisposable>(arg: T | IterableIterator<T> | un
 				d.dispose();
 			}
 		}
-		return arg;
+		return Array.isArray(arg) ? [] : arg;
 	} else if (arg) {
 		markTracked(arg);
 		arg.dispose();
diff --git a/src/vs/base/test/common/lifecycle.test.ts b/src/vs/base/test/common/lifecycle.test.ts
index 4d15ad2046c4c8aebf4dbfdc53972f555cc33b56..91f17aedb44cf76ec9e87f2a92b1fd48f5b852ed 100644
--- a/src/vs/base/test/common/lifecycle.test.ts
+++ b/src/vs/base/test/common/lifecycle.test.ts
@@ -48,6 +48,21 @@ suite('Lifecycle', () => {
 		assert(disposable.isDisposed);
 		assert(disposable2.isDisposed);
 	});
+
+	test('Action bar has broken accessibility #100273', function () {
+		let array = [{ dispose() { } }, { dispose() { } }];
+		let array2 = dispose(array);
+
+		assert.equal(array.length, 2);
+		assert.equal(array2.length, 0);
+		assert.ok(array !== array2);
+
+		let set = new Set<IDisposable>([{ dispose() { } }, { dispose() { } }]);
+		let setValues = set.values();
+		let setValues2 = dispose(setValues);
+		assert.ok(setValues === setValues2);
+
+	});
 });
 
 suite('Reference Collection', () => {