A file extension bug in Microsoft 365 can delete Word documents – Computerworld

A bug in version 2409 of Microsoft 365 can cause Word documents to be deleted instead of saved, Microsoft has warned. The bug affects files that contain the # character or have file extensions in uppercase, such as .DOCX or .RTF.

Until the company releases a permanent fix, users are being urged to check whether missing files they thought had been saved instead wound up in the Recycle Bin.

An alternative solution is to roll back Microsoft 365 to an older version, according to Bleeping Computer.