Umbra of Emberspike
Rancher
Somehow, the first boss of JotPK constantly ran to the left side and would not stop or shoot at all, making him incredibly easy to kill.
I had an active sheriff star power up at the time and it looked like it messed up his pathing as he came to the right the first time and took too many hits
I also occasionally still encounter a bug in which after summoning the horse, the farmer will move a bit but not move his feet, and cannot usually use items. Mounting the horse cancels it out. It looks like it happens when summoning the horse while moving or standing in a very particular position.