### 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)

code += ",cull_disabled";
			break;
		case CULL_MAX:
			break; 
	}
	switch (diffuse_mode) {
		case DIFFUSE_BURLEY:
			code += ",diffuse_burley";
			break;
		case DIFFUSE_LAMBERT:
			code += ",diffuse_lambert";
			break;
		case DIFFUSE_LAMBERT_WRAP:
			code += ",diffuse_lambert_wrap";
			break;
		case DIFFUSE_TOON:
			code += ",diffuse_toon";
			break;
		case DIFFUSE_MAX:
			break; 
	}
	switch (specular_mode) {
		case SPECULAR_SCHLICK_GGX:
			code += ",specular_schlick_ggx";
			break;
		case SPECULAR_TOON:
			code += ",specular_toon";
			break;
		case SPECULAR_DISABLED:
			code += ",specular_disabled";