### 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)

}
	if (features[FEATURE_SUBSURFACE_SCATTERING]) {
		code += "uniform float subsurface_scattering_strength : hint_range(0,1);\n";
		code += "uniform sampler2D texture_subsurface_scattering : hint_default_white," + texfilter_str + ";\n";
	}
	if (features[FEATURE_SUBSURFACE_TRANSMITTANCE]) {
		code += "uniform vec4 transmittance_color : source_color;\n";
		code += "uniform float transmittance_depth;\n";
		code += "uniform sampler2D texture_subsurface_transmittance : hint_default_white," + texfilter_str + ";\n";
		code += "uniform float transmittance_boost;\n";
	}
	if (features[FEATURE_BACKLIGHT]) {
		code += "uniform vec4 backlight : source_color;\n";
		code += "uniform sampler2D texture_backlight : hint_default_black," + texfilter_str + ";\n";
	}
	if (features[FEATURE_HEIGHT_MAPPING]) {
		code += "uniform sampler2D texture_heightmap : hint_default_black," + texfilter_height_str + ";\n";
		code += "uniform float heightmap_scale;\n";
		code += "uniform int heightmap_min_layers;\n";
		code += "uniform int heightmap_max_layers;\n";
		code += "uniform vec2 heightmap_flip;\n";
	}
	if (flags[FLAG_UV1_USE_TRIPLANAR]) {
		code += "varying vec3 uv1_triplanar_pos;\n";
	}
	if (flags[FLAG_UV2_USE_TRIPLANAR]) {
		code += "varying vec3 uv2_triplanar_pos;\n";
	}
	if (flags[FLAG_UV1_USE_TRIPLANAR]) {
		code += "uniform float uv1_blend_sharpness;\n";