hmm maybe you've already finished the quest? You can only get the goat invasion quest after rolling stone~ It's the one with kicking sebas~
Okay, I restarted and was able to do the rolling stone quest. At this point I haven't yet talked to Lothar to start the investigation, but I have done some quests that involve crafting some things, right now I'm doing the one where we harvest in the field and get 3 rosemary for Cane. Are those in a map that I'll find later?