While waiting DST new content to fully come out, I started playing Singleplayer HAM/SW.
Recently I built monkey farm where to farm Krampus, so I built alot of prime ape huts and a very small pen with doors where I droped silly monkey ball in the middle. As soon monkeys noticed ball and trying to get it (crowding to outside walls) game sound started to glitch out.
build a very small pen with gates and drop silly monkey ball in the middle. close gate and wait when monkeys will be interested to get monkeys ball.