Unfortunately, the problem with alpha transparency is still not solved. Basically, nothing has been done.
It has been now 4 months since I originally reported it. Please offer a specific date when you plan to address this bug?
Additionally, there is a problem with the height of the color line. It is of 4 pixels in Height. Which is fine if the icon is 16x16. But in above case, icons are 64x64 to ensure good visibility on HighDPI screen. The color line is tiny on such a display - it should be 16 pixels height (proportionally sized).