Enabling Rules through "Calculation Rules" does not enable Custom Calculations

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When trying to activate all rules in a ruleset via the "Calculation Rules" screen, it does not enable custom calcs. It throws an error in the Job Library, that says the name of our Custom Calculation and that there was an invalid member. However when I open the ruleset in "Rules" i can validate the custom calc and enable it manually. The ruleset then runs without error.

Is this a bug