[Bug 1456585] New: [freetype] nautilus shows empty thumbnail for font Padauk-Bold.ttf

https://bugzilla.redhat.com/show_bug.cgi?id=1456585

Bug ID: 1456585
           Summary: [freetype] nautilus shows empty thumbnail for font
                    Padauk-Bold.ttf
           Product: Fedora
           Version: 26
         Component: freetype
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail],
                    [e-mail],
                    [e-mail], [e-mail]

Description of problem:
On current Fedora 26, after opening /usr/share/fonts/sil-padauk in nautilus, an
empty thumbnail is shown for font Padauk-Bold.ttf. Likewise, opening the latter
in gnome-font-viewer displays an empty panel.

Version-Release number of selected component (if applicable):
freetype-2.7.1-8.fc26

How reproducible:
Always

Steps to Reproduce:
1. Open directory /usr/share/fonts/sil-padauk in nautilus.

Actual results:
An empty thumbnail for font Padauk-Bold.ttf is shown.

Expected results:
A preview of font Padauk-Bold.ttf is shown as a thumbnail.

Additional info:
Font Padauk-Bold.ttf is rendered correctly on current Fedora 25 with package
freetype-2.6.5-9.fc25.