Android 11 and MS Word/Excel changes not saving

We're having a problem with Android 11 devices: When checking out and opening a Word or Excel document with Microsoft Word or Excel (where there is a valid Office 365 account) do not save the changes back to M-Files: the last modified date is not updated and the document is not saved with changes. The document is checked out then back in again after saving changes. Has anyone else found this? Or the reverse: can anyone confirm that they have no issues with devices running 11?