Colour font preview issues

[NightFurySL2001]

The table list can show CBDT/CBLC colour font correctly, but fails to do so in the expanded view. See the screenshot below, where the list shows correctly but the right panel is empty.

Screenshot with Noto Color Emoji available on GitHub.

[JohnnyWestlake]

This might be an issue with the font itself; the grid shows the ColrV1 glyphs, whereas the right panel allows ColrV2. If the "says" it supports ColrV2 but then doesn't actually provide a glyph, it'll end up like this.