#1013075 aptitude: "aptitude why" outputs a chain with a package that is not installed

Package:
aptitude
Source:
aptitude
Description:
terminal-based package manager
Submitter:
Vincent Lefevre
Date:
2022-06-16 13:18:04 UTC
Severity:
normal
#1013075#5
Date:
2022-06-16 13:15:11 UTC
From:
To:
zira:~> aptitude why gobject-introspection
i   libglib2.0-dev         Suggests libgirepository1.0-dev (>= 1.62)
p   libgirepository1.0-dev Depends  gobject-introspection (= 1.72.0-1+b1)

while libgirepository1.0-dev isn't installed. So this doesn't give an
explanation of why gobject-introspection is automatically installed.

FYI, this is after

Start-Date: 2022-06-16  14:53:32
Commandline: apt install dh-sequence-gir gtk-doc-tools libgirepository1.0-dev libnss3-dev libglib2.0-doc libcairo2-doc
Install: libglib2.0-doc:amd64 (2.72.2-2), libnspr4-dev:amd64 (2:4.34-1, automatic), libnss3-dev:amd64 (2:3.79-1), python3-mako:amd64 (1.1.3+ds1-3, automatic), gobject-introspection:amd64 (1.72.0-1+b1), docbook:amd64 (4.5-10, automatic), python3-markdown:amd64 (3.3.7-1, automatic), gtk-doc-tools:amd64 (1.33.2-1), libcairo2-doc:amd64 (1.16.0-5), libgirepository1.0-dev:amd64 (1.72.0-1+b1), docbook-to-man:amd64 (1:2.0.0-45, automatic)
End-Date: 2022-06-16  14:53:36

Start-Date: 2022-06-16  15:01:07
Commandline: apt remove --purge dh-sequence-gir gtk-doc-tools libgirepository1.0-dev libnss3-dev libglib2.0-doc libcairo2-doc docbook-to-man libnspr4-dev
Purge: libglib2.0-doc:amd64 (2.72.2-2), libnspr4-dev:amd64 (2:4.34-1), libnss3-dev:amd64 (2:3.79-1), gtk-doc-tools:amd64 (1.33.2-1), libcairo2-doc:amd64 (1.16.0-5), libgirepository1.0-dev:amd64 (1.72.0-1+b1), docbook-to-man:amd64 (1:2.0.0-45)
End-Date: 2022-06-16  15:01:09