(BUG) AI failing to recognize energy requirements

Stay with me here. Auto battle is ON. I'm playing Celebi ex and Serperior (the one that gives double grass energy to all in the field) and Serperior's energy requirements are 4 to attack, Celebi ex is 2. When Serp has 2 energy on (and the ability is active), the AI will refuse to attack, despite it being able to. Celebi ex is the same way, it will not attack with 1 energy attached and Serp on the field. This has happened to me 4 times now in 2 separate battles vs the AI in "Expert Solo Battle". I would assume this issue is arising because the AI fails to recognize that both cards can attack with the ability Serp has, but because it doesn't have the physical energy, it cannot.