So I've been using a librarian for the past week to trade paper into emeralds. This trade is his 8th trade and no more trades have come up in since I've gained his 8th trade.Today, he's decided to create a new trade. Meaning my librarian villager now has nine different trades in his trading GUI. Has this happened to anyone else? I assumed librarians maxed out at eight trades.Also, I was killing Wither skeletons in the nether yesterday and on two occasions they dropped regular skeleton heads, and none dropped wither heads. According to the Wiki, Wither skeletons don't drop regular skeleton heads. So I hope you can understand my confusion.If anyone can enlighten me in either of my two problems I'd greatly appreciate it. Thanks!