Breaking changes
Common TEXMF root directories in a private (current user) installation
In the past, common TEXMF root directories (e.g., C:\Program Files\MiKTeX)
were in the input search path, even if MiKTeX was installed for the current user only.
As of 21.6.28, common TEXMF root directories are excluded from the input search path.
This should have no impact for most users, because these directories usually
do not exist when MiKTeX is installed for the current user.