ubuntu-support-status wrong support period for packages that were MIR mid-release

Some packages that were in universe at the time of the release then MIR mid-release are reported as being supported for 3y instead of 5y as other packages that were in main from day 1.

$ ubuntu-support-status --show-support | tail -3
Supported until April 2021 (Canonical - 3y):
libbrotli1 libwoff1

$ apt-cache policy libbrotli1 libwoff1
libbrotli1:
  Installed: 1.0.3-1ubuntu1.2
  Candidate: 1.0.3-1ubuntu1.2
  Version table:
 *** 1.0.3-1ubuntu1.2 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1.0.3-1ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
libwoff1:
  Installed: 1.0.2-1build0.1
  Candidate: 1.0.2-1build0.1
  Version table:
 *** 1.0.2-1build0.1 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1.0.2-1 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages

Additional info:

$ lsb_release -rd
Description: Ubuntu 18.04.2 LTS
Release: 18.04
$ apt-cache policy update-manager-core
update-manager-core:
  Installed: 1:18.04.11.9
  Candidate: 1:18.04.11.9
  Version table:
 *** 1:18.04.11.9 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:18.04.11 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: update-manager-core 1:18.04.11.9
ProcVersionSignature: Ubuntu 4.15.0-46.49-generic 4.15.18
Uname: Linux 4.15.0-46-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.6
Aptdaemon:

Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 15 14:09:58 2019
GsettingsChanges:
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-height' b'843'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'window-width' b'1373'
 b'com.ubuntu.update-manager' b'launch-time' b'int64 1535035046'
InstallationDate: Installed on 2018-07-15 (243 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180714)
PackageArchitecture: all
ProcEnviron:
 LANG=en_CA.UTF-8
 TERM=xterm-256color
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)