So, this is probably less of a bug, and more of a "we never updated it" type situation. On main, since recently (ish) we've been able to use colour codes as patrons every 10 seconds. I remember a time when colour code cooldowns were much longer, but this might be my memory betraying me. I think that the cooldown was never updated on Skyblock, and as such, still remains to be 10 minutes instead of the default 10 seconds. Since patron is a global feature, i thought i should probably report this as i don't think this is intentional, and it's quite annoying especially since you kind of have to use 1.12.2 to play skyblock, which makes hopping to main for a quick colour-coded trade message, or anything of the sort, basically impossibly difficult. How to recreate: Hop on skyblock and try to use colour codes twice within a minute. @TomKFC tested it in game real quick because he didn't believe me at first, he confirmed it's indeed 10 minutes.
Thanks for reporting. This will be fixed after our next maintenance. (Earliest this coming Monday, but might be sooner if I get around to it.)