I posed this question earlier but retracted it since I thought I fixed it. But alas! It has returned.
I have merged various color fonts into one file (with different color palettes in each master) which turns all my previews into unassigned colors (black). When I view the palette itself, all colors are there, and the export also works fine. When I split the file the colors return, but I would rather not work in this fragmented way.
It’s a pretty big file, with a lot of color layers (around 20 to 40 for each glyph), could this be the problem?