fix: Output shape validation will delete keys when there is a list of files

Signed-off-by: Lukas Schaefer <lukas@lschaefer.xyz>

Author: lukasdotcom

lib/private/TaskProcessing/Manager.php

@@ -1607,7 +1607,7 @@ public function encapsulateOutputFileData(array $output, ...$specs): array {
 				$file = $folder->newFile(time() . '-' . rand(1, 100000), $output[$key]);
 				$newOutput[$key] = $file->getId(); // polymorphic call to SimpleFile
 			} else {
-				$newOutput = [];
+				$newOutput[$key] = [];
 				foreach ($output[$key] as $item) {
 					/** @var SimpleFile $file */
 					$file = $folder->newFile(time() . '-' . rand(1, 100000), $item);