Problems with Alpha Tree add-on

[vjcatmac]

Describe the bug
Alpha tree is an add on that uses tree images with alpha channel, allowing to create large forests using only images. The PSA fog material is shown in the transparency area of the images, not only in the opaque area, resulting in a weird amount of fog, given that you can have thousands of planes, each one having a image of a tree. There should be a way by which the fog is only applied on the opaque area, as you should expect. That is, fog shouldn´t be applied to the areas where the transparency is 100%.
General information

• Blender version: 2.9, 3.1, 3.2
• Addon version: 1,6, all that include the fog feature
• Engine: evee an cycles
• Operating System:W10
• Other info that could be useful: cpu amd 5900x, gpu rtx3090

To Reproduce
Just add trees with alpha tree and apply the fog material

Screenshots
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