Adding a new custom data type as rule input to an interface not showing its sub-entries?

Certified Associate Developer

When adding a new custom data type as a rule input to interface, Appian does not recognize its entries:

Where my yellow circle is, I expect a "plus" symbol, and instead of the last "null" I should see something like [processStepId=,processStepName=,...] but I don't. What do I overlook?

Here the configuration of the first and last rule inputs, respectively:

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