Please add r.PostProcessing.PropagateAlpha 1 to the CVAR section

[farmerarmor]

It fixes the one eye black problem in multiple 5.6+ games and doesn't seem to have any downsides so perhaps you could add and enable it by default.

[joeyhodge]

here is an idea for implementing that in main project (maybe):
5.4.x and below: UE: 0, 1, or 2 (3 possible values, 2 being for tonemapper legacy fallback)
5.5+ UE: 0, or 1 (only 0 or 1, 2 is no more)
joeyhodge@8999dd8
so far seems like it is working well with no issues myself