The gun chemist archetype says under Alchemical Ordinance "Alchemical ordnance is treated like an alchemist’s bomb for the purpose of discoveries, though such discoveries ignore any effects associated with a bomb’s splash damage or radius unless the gun chemist also applies the exploding bullet discovery (see below)."
The problem is that the exploding bullet discovery and discoveries like tanglefoot bomb don't stack. So what is the meaning of "also applies"? Is exploding bullet like a prerequisite discovery?