Signs Removing (Smoker) text

Hello I'm reporting what i am assuming is a bug considering the word “smoker” is used in the game for a item i was playing on a realm and tried to label a smoker with a sign and it just removes the text of smoker and keeps all the other letter for instance if i put “smoker furnace, food items only” the sign will make it “Furnace food items only” if this could be fixed that would be fantastic to help labeling in my wonderful Minecraft world thanks guys!