Enumerator type variables changed to index instead of standard enumerator list in 5.1 in Niagara Systems

As the title suggests, I have a Niagara blueprint system that relies on custom-set collision channels for the Niagara Emitter.

In 4.25-5.0, I can use the ECollsionChannel enumerator as a parameter in the Niagara system and select custom channels from this list. In 5.1, I now only have the option of assigning an index, which is unintuitive as there is no way to find the correct index other than cross-checking the API reference

Is this intended behavior? The ECollsionChannel enumerator works the same in blueprints, but enumerators in Niagara systems only allow assigning of an integer value.