dpkg_status drops transitive dependencies for apt.install(dependency_set=...) (regression vs 0.8.0)

While migrating from 0.8.0 to 0.9.5, we noticed that `dpkg_status` for a `dependency_set` only lists the packages explicitly passed to `apt.install(dependency_set = "...", packages = [...])`, not their transitive dependencies - even though the transitive packages' files are still installed in the generated layer.

Can you confirm whether this is expected, or if it's fixable?

Start by reproducing the reported apt.install(dependency_set=..., packages=[...]) case and inspect the generated dpkg_status output, comparing it with the 0.8.0 behavior if available. Done means dpkg_status includes transitive dependencies as well as explicitly requested packages, while preserving the installed files in the generated layer.

Written by the indexing model from the issue text.