[Bug 1750891] New: font cache not getting update on Silverblue 31?

https://bugzilla.redhat.com/show_bug.cgi?id=1750891

            Bug ID: 1750891
           Summary: font cache not getting update on Silverblue 31?
           Product: Fedora
           Version: 31
            Status: NEW
         Component: fontconfig
          Assignee: tagoh(a)redhat.com
          Reporter: pnemade(a)redhat.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: ajax(a)redhat.com, caillon+fedoraproject(a)gmail.com,
                    fonts-bugs(a)lists.fedoraproject.org,
                    gnome-sig(a)lists.fedoraproject.org,
                    i18n-bugs(a)lists.fedoraproject.org,
                    john.j5live(a)gmail.com, mclasen(a)redhat.com,
                    pnemade(a)redhat.com, rhughes(a)redhat.com,
                    rstrode(a)redhat.com, sandmann(a)redhat.com,
                    tagoh(a)redhat.com
  Target Milestone: ---
    Classification: Fedora



Description of problem:
I have this system state

[parag@localhost ~]$ rpm-ostree status
State: idle
AutomaticUpdates: disabled
Deployments:
● ostree://fedora:fedora/31/x86_64/silverblue
                   Version: 31.20190909.n.0 (2019-09-09T08:24:14Z)
                BaseCommit:
093a07e18c0514e47e978c9c33ef73a2615117db343e0eef7218c298b1e3502c
              GPGSignature: Valid signature by
7D22D5867F2A4236474BF7B850CB390B3C3359C4
           LayeredPackages: gedit gnome-tweaks hunspell-hi langpacks-hi
libreoffice-core

  ostree://fedora:fedora/31/x86_64/silverblue
                   Version: 31.20190909.n.0 (2019-09-09T08:24:14Z)
                BaseCommit:
093a07e18c0514e47e978c9c33ef73a2615117db343e0eef7218c298b1e3502c
              GPGSignature: Valid signature by
7D22D5867F2A4236474BF7B850CB390B3C3359C4
           LayeredPackages: gedit gnome-tweaks hunspell-hi libreoffice-core
[parag@localhost ~]$ rpm-ostree db diff
ostree diff commit from: rollback deployment
(0ad271d38c5aa4e1ce194ea625f83862d2c317774d96ba9b94d53c5324133265)
ostree diff commit to:   booted deployment
(61f7aea98b458e53e42e85131e62ad7c84f80592676f28949cc5aa411e34ff55)
Added:
  glibc-langpack-hi-2.30-1.fc31.x86_64
  google-noto-sans-devanagari-ui-vf-fonts-20181223-6.fc31.noarch
  google-noto-sans-devanagari-vf-fonts-20181223-6.fc31.noarch
  hyphen-hi-1:0.7.0-14.fc31.noarch
  langpacks-core-hi-2.0-6.fc31.noarch
  langpacks-hi-2.0-6.fc31.noarch
  libreoffice-help-hi-1:6.3.1.2-1.fc31.x86_64
  libreoffice-langpack-hi-1:6.3.1.2-1.fc31.x86_64
  samyak-devanagari-fonts-1.2.2-22.fc31.noarch
  samyak-fonts-common-1.2.2-22.fc31.noarch
[parag@localhost ~]$ fc-list :lang=hi
/usr/share/fonts/lohit-devanagari/Lohit-Devanagari.ttf: Lohit
Devanagari:style=Regular
/usr/share/fonts/google-droid/DroidSansDevanagari-Regular.ttf: Droid
Sans:style=Regular
[parag@localhost ~]$ 


Version-Release number of selected component (if applicable):
fontconfig-2.13.92-2.fc31.x86_64

How reproducible:
always

Steps to Reproduce:
1. on F31, install any langpacks which will install additional fonts packages
like langpacks-hi
2. execute fc-list :lang=hi
3.

Actual results:
"fc-list :lang=hi" output remained same

Expected results:
"fc-list :lang=hi" should included rencently installed font packages as well

Additional info:

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