I found another bug. As you can see I already tried to make my herb into herbal powder, but it didn't work because I got a full inventory. I bought an empty slot, but the herbal powder is still present and won't go away.
I met the merman. He rescued me but didn't unlock him. I am guessing I have to drown a couple of times before he speaks to me. Another thing. I tried to hold a mushroom while holding a novel but it didn't change places and I can't recover that book. I gotta talk to the npc again. I hope I will get another one, I hope it wasn't an important book