### 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)

for (int i = 0; i < shader->functions.size(); i++) {
		if (shader->functions[i].name == p_name) {
			ERR_FAIL_INDEX_V(p_argument, shader->functions[i].function->arguments.size(), false);
			FunctionNode::Argument *arg = &shader->functions[i].function->arguments.write[p_argument];
			if (arg->tex_builtin_check) {
				_set_error(vformat(RTR("Sampler argument %d of function '%s' called more than once using both built-ins and uniform textures, this is not supported (use either one or the other)."), p_argument, String(p_name)));
				return false;
			} else if (arg->tex_argument_check) {
				
				if (arg->tex_argument_filter == p_filter && arg->tex_argument_repeat == p_repeat) {
					return true;
				} else {
					_set_error(vformat(RTR("Sampler argument %d of function '%s' called more than once using textures that differ in either filter or repeat setting."), p_argument, String(p_name)));
					return false;
				}
			} else {
				arg->tex_argument_check = true;
				arg->tex_argument_filter = p_filter;
				arg->tex_argument_repeat = p_repeat;
				for (KeyValue<StringName, HashSet<int>> &E : arg->tex_argument_connect) {