Sadly, the recent (today) update to MaxtoA did not fix this issue at all.
Using imagers, I can easily denoise a render (either Noice or Optix) but I cannot reliably do it for multiple AOVs. I chain the imagers together and it's totally unpredictable as to whether the denoised layers will be in the render, or not.
Often I'll add a denoise imager on, say, diffuse and add the output suffix -denoised, and end up with something like coat_denoise. totally different layer.
Arnold....get your act together. a few versions ago, at least we had a switch in our AOV dialog that let us denoise individual layers with Optix....and it worked. making denoisers imagers doesn't work at all.