Bug#1078455: apt: Solver 3.0 tries to install extra packages for no apparent reason
Looks like I had a misconfiguration in apt.conf.d:
APT::Get::Install-Recommends "false";
instead of
APT::Install-Recommends "false";
No error was issued, so I assumed it worked. This line seems to be the true cause of this bug in my case. Although I do not know if trying to install missing recommendations specifically during upgrades if Install-Recommends is true is desired behavior. If it is, then this bug can be closed.
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