In the jar file Polymorph and AE2 are not listed as a dependency, only minecraft and neoforge are.
This can easily cause issues when doing things like binary searching for mods that are causing issues. The dependencies not being listed means that the game crashes halfway through loading and you have to dig through the log to find out that the mod just didnt label its dependencies properly. When the dependencies are labeled properly the game will give the player a warning telling them exactly what they need only a few seconds into launching.
Using this version https://modrinth.com/mod/polymorphic-energistics/version/0.4.1