It seems that something is missing here; the code does not output the icons in the category descriptions after enabling Category Groups. This is good and expected:
NOTE: Bitcoin icon also does not look right; I also asked about allowing categories without colors.
This is the issue I found and the unexpected behavior:
Tag icons are gone. I think it may be related to the pairing of Category Groups with Horizon, I see code disabling the category descriptions.
In that case, can it be updated to allow us to display tags in category descriptions?