Are packages installed from PPA's or 3. party repositories identified as foreign packages?

[kelebek333]

Distro: Linux Mint 20 Ullyana
Version: 2.0.5

Packages that I installed from PPA or 3rd party repositories are listed as foreign packages even though repostories are added.

Currently LibreOffice PPA is added to my system. But packages from this repository are listed as foreign packages. Previous versions were not like that, if I delete the ppa repository, packages from that repository would be listed as foreign package. Is current situation a bug, or has the style of approach changed? Current situation is quite confusing.

apt policy libreoffice-base
libreoffice-base:
  Installed: 1:6.4.5-0ubuntu0.20.04.1~ppa1
  Candidate: 1:6.4.5-0ubuntu0.20.04.1~ppa1
  Version table:
 *** 1:6.4.5-0ubuntu0.20.04.1~ppa1 500
        500 http://ppa.launchpad.net/libreoffice/ppa/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
     1:6.4.4-0ubuntu0.20.04.1 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages
     1:6.4.2-0ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages