### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

"TYPE_INT",
	"TYPE_IVEC2",
	"TYPE_IVEC3",
	"TYPE_IVEC4",
	"TYPE_UINT",
	"TYPE_UVEC2",
	"TYPE_UVEC3",
	"TYPE_UVEC4",
	"TYPE_FLOAT",
	"TYPE_VEC2",
	"TYPE_VEC3",
	"TYPE_VEC4",
	"TYPE_MAT2",
	"TYPE_MAT3",
	"TYPE_MAT4",
	"TYPE_SAMPLER2D",
	"TYPE_ISAMPLER2D",
	"TYPE_USAMPLER2D",
	"TYPE_SAMPLER2DARRAY",
	"TYPE_ISAMPLER2DARRAY",
	"TYPE_USAMPLER2DARRAY",
	"TYPE_SAMPLER3D",
	"TYPE_ISAMPLER3D",
	"TYPE_USAMPLER3D",
	"TYPE_SAMPLERCUBE",
	"TYPE_SAMPLERCUBEARRAY",
	"INTERPOLATION_FLAT",
	"INTERPOLATION_SMOOTH",
	"CONST",
	"STRUCT",