For the ATC recording on You Tube in post#355 seems to come from a cheap VHF receiver that did not record all transmissions . This is obvious at end of tape where calls are answered by the TWR but the initial call is not recorded. (Possibly due to using different transmitters relays )
The whole thing would make much more sense if EK521 would have declared " EK521 going around" then the ATC transmission : "continue straight ahead climb to 4000" would make sense, the 4000 restriction also make sense especially if you had inbounds descending to 5000 opposite. The investigation will clear this up., plus not really a factor at all in this accident.