The ferris glyph u_F323 looks like this in outline view:
Note that there are multiple overlying outlines. Probably it was colored before. The multiple outlines are usually not a problem with svgs, but fonts are a bit more picky.
Anyhow, it looks good in fontforge's preview/render mode:
If this is used with the font, it renders correctly on Linux, but there is a problem with the windows font rendering engine:
The 'face' is rendered transparent, because it is two overlaying outlines.
The 'face' ellipsis should probably be removed.
At least it seems to be intended to have no 'face':
Finii
commented
2 years ago 
The ferris glyph
u_F323looks like this in outline view:Note that there are multiple overlying outlines. Probably it was colored before. The multiple outlines are usually not a problem with
svgs, but fonts are a bit more picky. Anyhow, it looks good infontforge's preview/render mode:If this is used with the font, it renders correctly on Linux, but there is a problem with the windows font rendering engine:
The 'face' is rendered transparent, because it is two overlaying outlines.
The 'face' ellipsis should probably be removed.
At least it seems to be intended to have no 'face':
Reported-by: @T-727 Reference: https://github.com/ryanoasis/nerd-fonts/issues/946