### 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 += "	NORMAL_MAP = triplanar_texture(texture_normal,uv1_power_normal,uv1_triplanar_pos).rgb;\n";
		} else {
			code += "	NORMAL_MAP = texture(texture_normal,base_uv).rgb;\n";
		}
		code += "	NORMAL_MAP_DEPTH = normal_scale;\n";
	}
	if (features[FEATURE_EMISSION]) {
		if (flags[FLAG_EMISSION_ON_UV2]) {
			if (flags[FLAG_UV2_USE_TRIPLANAR]) {
				code += "	vec3 emission_tex = triplanar_texture(texture_emission,uv2_power_normal,uv2_triplanar_pos).rgb;\n";
			} else {
				code += "	vec3 emission_tex = texture(texture_emission,base_uv2).rgb;\n";
			}
		} else {
			if (flags[FLAG_UV1_USE_TRIPLANAR]) {
				code += "	vec3 emission_tex = triplanar_texture(texture_emission,uv1_power_normal,uv1_triplanar_pos).rgb;\n";
			} else {
				code += "	vec3 emission_tex = texture(texture_emission,base_uv).rgb;\n";
			}
		}
		if (emission_op == EMISSION_OP_ADD) {
			code += "	EMISSION = (emission.rgb+emission_tex)*emission_energy;\n";
		} else {
			code += "	EMISSION = (emission.rgb*emission_tex)*emission_energy;\n";
		}
	}
	if (features[FEATURE_REFRACTION]) {
		if (features[FEATURE_NORMAL_MAPPING]) {
			code += "	vec3 unpacked_normal = NORMAL_MAP;\n";
			code += "	unpacked_normal.xy = unpacked_normal.xy * 2.0 - 1.0;\n";