net-tools has been Priority: optional since Debian stretch, released
in 2017:

https://lists.debian.org/debian-devel/2016/12/msg00775.html

... yet this package source code still claims it's "important":

https://sources.debian.org/src/net-tools/2.10-2/debian/control

It's cosmetic, but the field should probably be fixed (and, I think,
just removed, since `optional` is now the default...)