BPMN executes Successfully but Business Rule Task doesn't output DMN Decision Result

I have a BPMN process with a DMN Decision Table that uses a process variable as input. This input process variable is initialized and populated by a user task and is behaving as expected.

Process execution seems to finish successfully. I see no error logs, but the resultVariable defined within the Business Rule Task, has value of null.

I have changed the value of Camunda:resultVariable within the Business Rule Task but regardless of the name, it always ends up with a null value after execution.

I wonder if it’s safe to assume that successful process execution means the Business Rule Task was bound correctly to the DMN Table and it was able to compute a decision.

It just seems that the very last step: storing the decision result is missing.

Is there something I’m missing in the output variable mapping configuration?

Input Process Variable is a string called day and I pass a value of "Tuesday" in the User Form.

Business Rule Task

name="Sukesh and Davids" 


<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="https://www.omg.org/spec/DMN/20191111/MODEL/" xmlns:biodi="http://bpmn.io/schema/dmn/biodi/2.0" xmlns:camunda="http://camunda.org/schema/1.0/dmn" id="Definitions_0obggq4" name="DRD" namespace="http://camunda.org/schema/1.0/dmn" exporter="Camunda Modeler" exporterVersion="4.8.1">
  <decision id="Decision_04xd30d" name="DayofWeek">
    <decisionTable id="DecisionTable_192eifp">
      <input id="day" label="day" biodi:width="192" camunda:inputVariable="day">
        <inputExpression id="InputExpression_1" typeRef="string">
      <output id="result" name="result" typeRef="string" />
      <rule id="DecisionRule_19dx5je">
        <inputEntry id="UnaryTests_0at02b6">
        <outputEntry id="LiteralExpression_0mzgwqa">
      <rule id="DecisionRule_1riumo2">
        <inputEntry id="UnaryTests_1x6esu9">
        <outputEntry id="LiteralExpression_10386ld">

I’m expecting my result variable to display a value of "Yes" but it’s null.

However, I can see the variable and the correct value here in the logs:

ActivityInstance(activityId=dmn-task_ROwzbZaAn, activityName=foo, 
type=businessRuleTask, startTime=1696528253654, endTime=1696528253679), ActivityInstance(activityId=terminus-exit_l6BSxVGo0U, activityName=null, type=noneEndEvent, 
startTime=1696528253680, endTime=1696528253680), 
 activityName=null, type=startEvent, 
startTime=1696528230509, endTime=1696528230510)],
 variables=[VariableInstance(name=day, typeName=string, value=Monday), VariableInstance(name=result, typeName=object,
 value=[{result=Yes}])], incidents=[])