Here is the yaw issue people have been talking about easily illustrated.
Fellow user mrburns666 has documented that this change happened after the V01.00.0200 update here.
If you would like to try this out for yourself, cover the VPS sensors completely and fly in a location without GPS signal. Fly carefully, your drone will drift around.
Maybe if we make enough noise, DJI will add an option to configure the yaw behavior of the MM.