Saving file with Protected Mode enabled alters Windows file permissions

Using Adobe Acrobat Reader DC (Version: 20.12.20048.400142) with Protected Mode Enabled At Statup set to: True...

I have a PDF file that has "broad" file permissions - multiple user groups have read/write access to the file.

I open the file in PDF Reader and then Save it (same filename).

When I review the file permissions in Windows, I see that some user groups have been removed and that my user has been granted specific access to the file.

If I turn off Protected Mode, then the Windows file permissions do not get modifed.

Why is Protected Mode altering the Windows file permissions?

I cannot find any documentation stating that file permissions would be modified.

Is this a known issue ?

Other than turning off Protected Mode, how do I stop the file permissions from being modified?