FabFilter

I want to use the Pro-MB for my mastering chain, but I prefer to work with mid/side and not stereo. Since it is not possible to have different settings on the same frequency area for mid and for side, I decided to go for 2 parallel instances of Pro-MB in the chain.

So the first instance has all of the bands set to mid, the second instance has all of the bands set to side.

What I notice is that the 100% side setting doesn't receive any audio (from a stereo source, with plain vanilla stereo output). All settings are similar between the two instances, only the mid/side settings are different.