Ray tracing translucency samples per pixel settings have no visible effect.
Reported and tested in version 4.25.3(CL 13942748). Tested and found in versions 4.25.3 and 4.26.0 Preview 2(CL 14419252).
Result: Ray Tracing Translucency still very noisy.
Expected: Ray Tracing Translucency not as noisy.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-101272 in the post.