I was on TrueNAS 12 and winmsa worked fine (and FreeNAS 11 as well). But I recently updated to TrueNAS 13 (I also tried 13U1). Attached files are my SMB config (exact config that I used on 11 and 12), the error when trying to rename a folder (with winmsa on), the error when trying to delete a folder (with winmsa on). Tested on Windows 10 and 11.