[Cycles] Transparent textures causing issues

[SynaGl0w]

You need to set the alpha mode to the new “channel packed” mode recently added to 2.80:

Textures and Alpha Modes, Oh my!

I am having trouble understanding the purpose of the recent change to the texture alpha mode setting as specified in the recent meeting notes: Image texture alpha modes have been changed. The new Channel Packed mode can be used for channel packing as commonly used by game engines, where the RGB and Alpha channels contain different images that should not affect each other. The new None replaces the Use Alpha option. ( Brecht Van Lommel ) As it stands now, “Straight” and “Premultiplied” ar…

Straight alpha mode, despite it’s description and name, still premultiplies the color channels by alpha, etc.