A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
We've just started seeing this issue as well.
Some specifics on trying to duplicate:
Excel 16.34 for OSX
OSX 10.14.6
Storage:
Dell Fluid FS (its basically a nas file system running linux) the one thing that might be related is OSX was ignoring some file/folder inheritance when the share level permissions were set to full control. The work around this Authenticated Users are set to "Write" rather then "Full Control" This is specific to the share level permissions, not NTFS permissions. This setting kept OSX from directly adding user permissions to files. It may have nothing to do with this, but its what comes to mind.
I'm working to try and test if the share level permissions are related.