ProRes 4444 exhibits different levels in MC/Symp 7.03

Fast imported Arri LogC from an Alexa has less contrast viewed in 7.03 than in 6.05/7.02.
This was first noticed when CC graded sequences looked more contrasty on the assistant's MC running 6.05.
The level change is roughly equivalent to Full swing to legal.
Transcoding to DNxHD36 in 7.03 bakes the change in.
So if you view the original and above transcoded footage in 7.02 they will look different.

Colour Transformations in 7.03 are disabled.
Footage imported in 6/7.02/7.03 has same behaviour.

I have reverted to 7.02.