Custom Shader Error: Undefined variable 'environment_rotation'

Hello!
I am using a custom shader as part of a pipeline and it generates this error, failing to render:

error C1503: [Shader Helpers] .... error C1503: undefined variable "environment_rotation" 

I saw one related post that suggests 'environment rotation' variable has been replaced by 'environment_matrix', substituting each instance  then generates a new error:

[Shader Helpers] 5(368) : error C7623: implicit narrowing of type from "vec3" to "float"

I assume this is because the newer environment matrix is a different data type, but some guidance on how to update the .glsl file to work properly would be helpful.

I did try one fix that allows the shader to render, replacing 'environment_rotation' with 'uniform_environment_rotation', but I am not sure if this matches the previous shader exactly. 

Any tips?

Thanks!