Ableton - Save M4L device mappings in effect racks presets

[KMKMKM]

Hep,

I try to save my M4L device mapping in effect rack. The idea is to have pre-mapped M4L modulation device on VSTs that lack modulation ( Unfilterd Audio latest effects for instance ). That way I can recall the rack and I don't have to remap everything everytime.

The problem is that it seems that M4L devices can't save their mapping when they are saved in an Effect Rack preset. I tried with third party M4L devices and also with stock lfos.

It seems weird to me that it's impossible to do.

Any idea or workaround ?
Cheers

K