Hello i am an owner of matrice 200 with z30 updated both dji go 4 and matrice / remote controller / batteries  to the latest firmware
using ipad mini 4 for mobile device , when  i set gimbal on follow mode ( dji go 4 I do not have yaw on the aircraft  , when I set gimbal on free yaw is  operating normally .

When I use Ground station PRO YAW is operating normally

specs

matrice 200 latest update  sub systems recalibrated
remote controller latest update recalibrated
Batteries   TB55 Updated
ipad mini 4 latest ios reset all content and settings , clean instalation of dji go 4  
dji go 4 latest version 4.2.20


Dji please inform

Sorry for the troubles. I'll forward to our engineers to check the exact status.

Any solution for the best industrial drone on the market ; It is unorthodox not to have Yaw when camera gimbal settings is on follow mode !