Modify MPR grants Read on Objects

Good day together

I have the problem on a MIM 2016 SP2 with hotfix 4.6.355.0 that I have cleanly separated read and change MPR's on the objects. 

I noticed that the Modify MPR's without read operation automatically always allow to read the attribute. 

Is this a normal behaviour, I always thought that for modifying attributes both read and modify must be enabled on the Permission Granting MPR?

If this was the case in the past, since when has it been changed?

Does anyone here have similar behavior or more information for me?

KR Mario