CC2018 - Magic Wand tool selection problems
When working on a transparent layer, the magic wand tool will select all non-transparent pixels, failing to distinguish between very opaque and nearly transparent pixels:

with a white background layer to better show the contrast between the opaque and nearly transparent pixels:

I've controlled for tolerance, selection size, etc. I've also gone through all the preferences that seem relevant but can't find a solution.
Anyone else had this issue or is there some setting I may have overlooked?
