Steps to reproduce:

1.  Create a enum byte or long // public enum MyEnum : byte { A, B, C }
2.  Create and open a new Behavior Graph
3.  Create a new Blackboard Variable of the enum

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Actual results: 

• exception is thrown: InvalidCastException: Specified cast is not valid.
• created variable is not visible in the blackboard view.

Expected results: 

• No exception
• Created Variable visible in the blackboard view

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Reproducible with versions: 
1.0.0 - 1.0.13

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Tested on (OS): 
Win 11