[Help Wanted] All transparent objects in the scene only get lit half way by point light

Hi all,

We have encountered a weird graphics problem, where all of our transparent objects in the scene only get lit half way (only from the y position downward) by a point light. This happens with all of our grass and tree shaders.

Also, when looking through translucent objects, they become really desaturated and gray-is which is an undesired effect.

Does anyone know how to deal with this problem? Please refer to the screenshots below.

We are using Unity 2020.1.14f, built-in render pipeline with a forward renderer.

For grass and trees we are using the Fantasy Adventure Environment, but all other grass shaders from other packages have the same problem.