Is there any gudes what SBSAR features are supposed to work in Photoshop ?

I see that  image have to be exactly power of 2  to works pixel accurate in ultra resolution.   Grayscale inputs work mostly .    .  But when I try to use layer transparency as secondary input  to primary RGB  one  i see nothing .

I want to recreate slope blur  in Photoshop.   Can I do it?      With chat GPT  finally starting to do actually working scripts    I am trying to do a sort of come back to Photoshop  that collected lots of dust at my PC  few recent years.   An ability to do custom  live filters  by Designer  like  height to normal map conversion, live frequency separation  tricks and so on  is so cool .    Yet I still don't understand why one  SBSAR works perfectly fine  and another one doesn't work at all.     What are the  limitations?    Chat GPT tells me sbsar should accept RGBA  channels of a rasterized smart object in Photoshop.   Is it hallucinating?