Why the '--sec-security=' option is not honoring the packages as per Severity?

Issue

• The command yum updateinfo list security updates --sec-severity=Critical should list only Critical packages. However, it does not work and all the packages are listed. The same happens with Important and Moderate.

[root@rhel8 ~]# yum updateinfo list security updates --sec-severity=Critical
Updating Subscription Management repositories.
Last metadata expiration check: 0:37:56 ago on Tue 16 Jul 2019 06:24:30 PM IST.
RHSA-2019:0966 Critical/Sec.  firefox-60.6.1-1.el8.x86_64
RHSA-2019:1269 Critical/Sec.  firefox-60.7.0-1.el8_0.x86_64
RHSA-2019:1517 Moderate/Sec.  gvfs-1.36.2-2.el8_0.1.x86_64
RHSA-2019:1517 Moderate/Sec.  gvfs-afc-1.36.2-2.el8_0.1.x86_64
RHSA-2019:1167 Important/Sec. kernel-4.18.0-80.1.2.el8_0.x86_64
RHSA-2019:1479 Important/Sec. kernel-4.18.0-80.4.2.el8_0.x86_64
RHSA-2019:0983 Important/Sec. wget-1.19.5-7.el8_0.1.x86_64

This does not happen in Red Hat Enterprise Linux 7.x or Red Hat Enterprise Linux 6.x. The command only fails if security updates is used.

[root@rhel8 ~]# yum updateinfo list --secseverity=Moderate     <----- getting required results
Updating Subscription Management repositories.
Last metadata expiration check: 0:06:18 ago on Thu 18 Jul 2019 11:07:35 AM EDT.
RHSA-2019:0990 Moderate/Sec. systemd-239-13.el8_0.3.x86_64
RHSA-2019:0990 Moderate/Sec. systemd-libs-239-13.el8_0.3.x86_64

[root@rhel8 ~]# yum updateinfo list updates --secseverity=Moderate       <----- getting required results
Updating Subscription Management repositories.
Last metadata expiration check: 0:07:40 ago on Thu 18 Jul 2019 11:07:35 AM EDT.
RHSA-2019:0990 Moderate/Sec. systemd-239-13.el8_0.3.x86_64
RHSA-2019:0990 Moderate/Sec. systemd-libs-239-13.el8_0.3.x86_64