Is it possible to decorate a synthetic service (set at runtime)?
When I try to do so I get the error message A synthetic service ("Vendor\Product\Decorator.inner") must be public.

Here's the YAML file

services:
  Vendor\Product\Synthetic:
    public: true
    synthetic: true
  Vendor\Product\Decorator:
    class: stdClass
    decorates: Vendor\Product\Synthetic
    public: true