https://bugzilla.redhat.com/show_bug.cgi?id=2262410
--- Comment #15 from Akira TAGOH tagoh@redhat.com --- Well, not that easy to fix. It seems that they use FC_CHARSET to check the coverage and select a font (see https://github.com/libass/libass/blob/master/libass/ass_fontselect.c#L722 and https://github.com/libass/libass/blob/master/libass/ass_fontconfig.c#L55). though I don't know why they have different bounding box (or using different size? dunno) for both fonts.