CallOperationAction not functioning?

[EAButNotForGames]

I am trying to run a CallOperationAction in a simulation. But it always stops at the CallOperationAction and doesn't proceed.
The operation isn't the issue.
Even crashed EA and made the repository unusable. Thank god it was one I made to test some stuff in EA.
Both the EA User Guide and the Simulation and Behavior PDF weren't helpful.


I would prefer to use the CallOperationAction because the code generation looks a bit nicer with it.
If I call an operation in an atomic action, I have to write the whole sim path in Javascript, which I then have to clean up in the generated code.
Using the CallOperationAction I get something like:
OutptPin1 = someOperation();
Which is a bit nicer.

Anyone got an idea or is this just deprecated?