Minecraft's formatting codes (e.g §a and §r) appear on discord though they don't actually have the desired effect. This can make formatted text (usually displayed through commands from datapacks or mods, as you can't manually type those codes) difficult to read from Discord. A full list of the formatting codes can be found here, or simply ignoring the § character and whatever character follows it would work.
A further enhancement would be to make the font-related formatting codes apply the Discord formatting codes. E.g. §lI'm Bold§r. I'm not bold -> **I'm Bold**. I'm not bold