The page https://tracker.pureos.net/w/development/packaging_overview/ documents how to add a _higher_ number when forking from Debian.

That makes sense when deriving from Debian due to added/changed features, but is problematic when "backporting" - i.e. rebuilding with virtually no changes e.g. to bypass Debian quality assurance or to include a package from Debian Bullseye in PureOS Amber.

Please document the use of ~pureosN as an alternative versioning scheme, and strongly encourage or even mandate that scheme for all cases where it is beneficial to switch to tracking the Debian package as soon as possible.