Create an arry of Shader materials?

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Reve

I'm using Godot 4. I can load an array of BaseMaterial3D objects like this:

const _materials = [
	preload("../blocks/terrain_material.tres"),
	preload("../blocks/terrain_material_transparent.tres"),
	preload("../blocks/terrain_material_foliage.tres")
]

But, if I open up those .tres files and convert the materials to shader materials then the same code gives me this error:
Variant array is not compatible with an array of type "<unresolved type>".

good material:

bad material:

Any idea whats going on?
Thanks!