While typing the word "Duchy" on a sign, (for whatever reason, it doesn't happen as a stand-alone word) all the text on the sign will turn into all hashtags. The word isn't offensive, and as far as I'm aware it doesn't have a negative connotation, but the censoring algorithm flags it.

It's a very small issue, but it sucks for a player like me who uses Minecraft for creating worlds and countries that, for instance, may be Duchies or Grand Duchies.