Please share the CUPS manual intervention process like they have in the stable update: [Stable Update] 2020-12-03 - Xorg-Server, Plasma 5.20.4, Cinnamon 4.8.0, Deepin, KDE-git
I found that you only need to do:
sudo systemctl disable --now org.cups.cupsd.socket
sudo systemctl disable --now org.cups.cupsd.service
sudo systemctl disable --now org.cups.cupsd.path
sudo systemctl enable --now cups.service