I've got a real problem with this. Granted, when a go-around is issued by tower, they almost always follow with an exiting instruction, "Dmbass 1234 go around, fly runway heading maintain 2300 ft, contact departure 123.45"
Even when it is a pilot initiated go around, the controller will usually come back with an instruction after the go around call is readback. However, things do get busy for controllers too and if I call a go around, dont hear from tower, i am NOT going to just fly a pattern....what if i am landing on the center? I have no idea who's departing the L or R! Then again, I would be as forceful as I could to get an instruction, but I think it is reasonable to fly a published missed in this situation, especially if I were to lose comms.