There are only 2 available buffers at a Pixel Filter level since LW2018,
not exactly a feature request because we got all of them in LW2015.

Also the behavior of a Pixel Filter has changed,
when we have 2 instances,
before 2018 a full frame was evaluated in the first pixel instance,
then the second pixel instance started a second evaluation,
no more the case, so we can't no more applying some kind
of kernel effect at this level.

I can't find statement or comments about this,
is this definitively locked, just missing, not possible in the new engine?