### 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)

} else {
				from += get_datatype_name(type);
			}
			from += "[";
			from += itos(array_size);
			from += "]'";
			String to;
			if (type == TYPE_STRUCT) {
				to += p_struct_name;
			} else {
				to += get_datatype_name(p_type);
			}
			to += "[";
			to += itos(p_array_size);
			to += "]'";
			_set_error(vformat(RTR("Cannot convert from '%s' to '%s'."), from, to));
			return nullptr;
		}
	}
	ArrayConstructNode *an = alloc_node<ArrayConstructNode>();
	an->datatype = p_type;
	an->struct_name = p_struct_name;
	if (tk.type == TK_PARENTHESIS_OPEN || auto_size) { 
		while (true) {
			Node *n = _parse_and_reduce_expression(p_block, p_function_info);
			if (!n) {
				return nullptr;
			}
			if (!_compare_datatypes(p_type, p_struct_name, 0, n->get_datatype(), n->get_datatype_name(), n->get_array_size())) {
				return nullptr;