Font Inconsistency in Loading Screen Messages

I have noticed at least 2 messages that appear while the world is generating do not use the usual English (US) Minecraft font, and instead use one with sleek, thin characters. I can't recall verbatim what the exact texts were, however I know one was about not needing a saddle to tame a Skeleton Horse and the other about needing an iron pick to mine diamonds (or something along those lines.)