Summary:

When evaluating a decision model that contains a MultiInstanceDecision, the result will often times be [null], because the engine will not evaluate the decision dependencies of the MID first, and simply execute the MID with empty inputs instead.

Details:

The statement that will cause decisions to consider their requirements during evaluation is missing for MultiInstanceDecisions:

compiler.linkRequirements( model, di );

 Inside org.kie.dmn.signavio.MultiInstanceDecisionLogic.MultiInstanceDecisionNodeCompiler#compileEvaluator