We only get glyph outline(glyf, CFF, CFF2), not any kind of glyph data table like bitmap/image/color/svg.
So there may be some font face which supports asked character, but the tui preview show empty result. But many fonts also provided a outline as fallback, so it's not very likely to happen.
Therefore, personally I consider it a low priority issue . If you meet this, feel free to comment here.
We only get glyph outline(glyf, CFF, CFF2), not any kind of glyph data table like bitmap/image/color/svg.
So there may be some font face which supports asked character, but the tui preview show empty result. But many fonts also provided a outline as fallback, so it's not very likely to happen.
Therefore, personally I consider it a low priority issue . If you meet this, feel free to comment here.