MPE seems to not work properly in the Fx region.
If I assign for example the Mod Source - MPE Z (Press.) on the cutoff of the main filter in the OSC page it does work perfectly for each individual midi note when played together but if I do the same on the filter in the Fx page it doesn't and all the notes get effected in the same way by the filter when played together, even if I draw different envelopes for each note
(I do use ableton live 11.0.2 Suit and noticed this through the Note Expression section in live since I do not own an MPE midi controller)