Mono fonts don't have displayed in Konsole appearance settings

[Said Bakr]

Synopsis:
1- Install "Syne Mono" using the app.
2- Open KDE Konsole.
3- From Settings > Edit Current Profile > Appearance Tab.
4- Click on Fonts Choose button.
5- Look at Font list in the "Select Font dialogue"
6- The font "Syne Mono" is not listed there.

I have to check the box labeled: "Show all fonts" to get "Syne Mono" listed.

Conclusion:
There is an installation issue that prevents the system from recognize the new installed font as Mono font, because any recognized Mono font should be listed in step 5. In that list, Microsoft Courier New is listed there which I had installed using "sudo apt install ttf-mscorefonts-installer"

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: typecatcher 0.3-1.1
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.17
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Tue May 11 19:43:31 2021
InstallationDate: Installed on 2021-05-04 (6 days ago)
InstallationMedia: Kubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
PackageArchitecture: all
SourcePackage: typecatcher
UpgradeStatus: No upgrade log present (probably fresh install)