Microsoft recently published an advisory for a glitch that causes Word for Microsoft 365 to accidentally delete files. The company is likely working on a patch,

Microsoft has confirmed a bug in Word for Microsoft 365 that deletes files if you try to save them.

Microsoft has fixed a known issue that was causing Word to delete some Windows users' documents instead of saving them.

Microsoft issues an advisory regarding automatically deleting a Word document using a capitalized file extension and a hashtag in the file name under a specific sequence to save the file via Microsoft 365's Word app.