Multi Instance Tasks - Unable to deserialize variable in camunda task list

Hi have a Process model, where the multi instance sub process is present as shown below.

The Step 1 human task is linked with the below embedded form.

firstForm.html

<form role="form" class="form-horizontal">

    <script cam-script type="text/form-script">

    var system = $scope.systems = [{'systemName':''}];

    camForm.on('form-loaded', function() {
      camForm.variableManager.createVariable({
        name: 'system',
        type: 'Object',
        value: system,
        valueInfo: {
          // indicate that object is serialized as json
          serializationDataFormat: 'application/json',
          // provide classname of java object
          objectTypeName: 'java.util.ArrayList'
        }
      });
    });

    camForm.on('submit', function() {
      // remove '$$hashKey' properties from address objects
      angular.forEach(system, function(addr) {
        console.log(addr);
        delete addr.$$hashKey;
      });
      console.log(system);
    });

    $scope.addUser = function() {
       var newUser = {'systemName':''};
       $scope.systems.push(newUser);
   };

   $scope.removeUser = function(system) {
       var index = $scope.systems.indexOf(system);
       $scope.systems.splice(index,1);
   };

  </script>

    <h1> Add Systems </h1>
    <button class="btn btn-primary" ng-click="addUser()">Add System</button>
    <div ng-repeat="system in systems">
        <div class="row">
            <div class="control-group">
                <label class="control-label" for="systemName">Enter System <span>{{ $index + 1 }}.</span></label>
                <div class="controls">
                    <input id="systemName" class="form-control" type="text" ng-model="system.systemName" required />
                </div>
            </div>
            <button ng-click="removeUser(system)" ng-if="systems.length>1">Remove</button>
        </div>
    </div>

</form>

I have executionListener that gets executed at the end of Step 1 task. I am setting the collection variable in execution listener. Based on the size of the collection n number of sub process is invoked.

@Slf4j
public class DDMultiTaskDelegate implements JavaDelegate {
    @Override
    public void execute(DelegateExecution delegateExecution) throws Exception {
        //Object object = delegateExecution.getVariable("system");
        List<DDSystem> userSystems = (List<DDSystem>) delegateExecution.getVariable("system");;
        delegateExecution.setVariable("systemList", userSystems);
    }
}

I am trying to display the task variable for the step 2 task using the below code.

<form role="form" class="form-horizontal">

    <script cam-script type="text/form-script">

    camForm.on('form-loaded', function() {
      // tell the form SDK to fetch the variable named 'customer'
      camForm.variableManager.fetchVariable('sys');
    });
    camForm.on('variables-fetched', function() {
      // work with the variable (bind it to the current AngularJS $scope)
      $scope.system = camForm.variableManager.variableValue('sys');
    });
  </script>
        <div class="control-group">
            <h3>System Name : </h3> <span>{{system.systemName}}</span>
        </div>
    </form>

But when the variable is fetched it is not getting deserialized. I am getting the below response from the server for the rest call http://localhost:8081/api/engine/engine/default/task/6c46024e-ffbd-11e9-a7d3-005056b47730/form-variables?deserializeValues=false&variableNames=sys

{"sys":{"type":"Object","value":"rO0ABXNyABdqYXZhLnV0aWwuTGlua2VkSGFzaE1hcDTATlwQbMD7AgABWgALYWNjZXNzT3JkZXJ4cgARamF2YS51dGlsLkhhc2hNYXAFB9rBwxZg0QMAAkYACmxvYWRGYWN0b3JJAAl0aHJlc2hvbGR4cD9AAAAAAAABdwgAAAACAAAAAXQACnN5c3RlbU5hbWV0AAZBbWF6b254AA==","valueInfo":{"objectTypeName":"java.util.LinkedHashMap","serializationDataFormat":"application/x-java-serialized-object"}}}

Here is the bpmn.

<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_0o21fd8" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="3.1.2">
  <bpmn:process id="camunda-test" name="Camunda Test Process" isExecutable="true">
    <bpmn:startEvent id="StartEvent_1">
      <bpmn:outgoing>SequenceFlow_1war6r2</bpmn:outgoing>
    </bpmn:startEvent>
    <bpmn:sequenceFlow id="SequenceFlow_1war6r2" sourceRef="StartEvent_1" targetRef="Task_1kw6h8b" />
    <bpmn:userTask id="Task_1kw6h8b" name="Step1" camunda:formKey="embedded:app:forms/firstForm.html" camunda:candidateGroups="MetadataScanningTeam">
      <bpmn:extensionElements>
        <camunda:executionListener class="com.xyz.diw.service.DDMultiTaskDelegate" event="end" />
      </bpmn:extensionElements>
      <bpmn:incoming>SequenceFlow_1war6r2</bpmn:incoming>
      <bpmn:outgoing>SequenceFlow_1n4omi3</bpmn:outgoing>
    </bpmn:userTask>
    <bpmn:subProcess id="SubProcess_16ii7vk" name="Secondary Sub Process">
      <bpmn:incoming>SequenceFlow_1n4omi3</bpmn:incoming>
      <bpmn:outgoing>SequenceFlow_0u0dpn4</bpmn:outgoing>
      <bpmn:multiInstanceLoopCharacteristics camunda:collection="systemList" camunda:elementVariable="sys" />
      <bpmn:startEvent id="StartEvent_0hmj9us">
        <bpmn:outgoing>SequenceFlow_0k9gw4m</bpmn:outgoing>
      </bpmn:startEvent>
      <bpmn:sequenceFlow id="SequenceFlow_0k9gw4m" sourceRef="StartEvent_0hmj9us" targetRef="Task_0zfgdnv" />
      <bpmn:sequenceFlow id="SequenceFlow_0awtesr" sourceRef="Task_0zfgdnv" targetRef="Task_0fl5f96" />
      <bpmn:endEvent id="EndEvent_1sgs88n">
        <bpmn:incoming>SequenceFlow_1f0yvsl</bpmn:incoming>
      </bpmn:endEvent>
      <bpmn:sequenceFlow id="SequenceFlow_1f0yvsl" sourceRef="Task_0fl5f96" targetRef="EndEvent_1sgs88n" />
      <bpmn:userTask id="Task_0zfgdnv" name="Step  2 - ${sys.systemName}" camunda:formKey="embedded:app:forms/dd-display-form.html" camunda:candidateGroups="MetadataScanningTeam" camunda:dueDate="P1W">
        <bpmn:incoming>SequenceFlow_0k9gw4m</bpmn:incoming>
        <bpmn:outgoing>SequenceFlow_0awtesr</bpmn:outgoing>
      </bpmn:userTask>
      <bpmn:userTask id="Task_0fl5f96" name="Step  3 - ${sys.systemName}" camunda:formKey="embedded:app:forms/dd-display-form.html" camunda:candidateGroups="MetadataScanningTeam" camunda:dueDate="P1W">
        <bpmn:incoming>SequenceFlow_0awtesr</bpmn:incoming>
        <bpmn:outgoing>SequenceFlow_1f0yvsl</bpmn:outgoing>
      </bpmn:userTask>
    </bpmn:subProcess>
    <bpmn:sequenceFlow id="SequenceFlow_1n4omi3" sourceRef="Task_1kw6h8b" targetRef="SubProcess_16ii7vk" />
    <bpmn:endEvent id="EndEvent_1hb267s">
      <bpmn:incoming>SequenceFlow_0u0dpn4</bpmn:incoming>
    </bpmn:endEvent>
    <bpmn:sequenceFlow id="SequenceFlow_0u0dpn4" sourceRef="SubProcess_16ii7vk" targetRef="EndEvent_1hb267s" />
  </bpmn:process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="camunda-test">
      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">
        <dc:Bounds x="156" y="103" width="36" height="36" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="SequenceFlow_1war6r2_di" bpmnElement="SequenceFlow_1war6r2">
        <di:waypoint x="192" y="121" />
        <di:waypoint x="242" y="121" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNShape id="UserTask_0mh1ecs_di" bpmnElement="Task_1kw6h8b">
        <dc:Bounds x="242" y="81" width="100" height="80" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="SubProcess_16ii7vk_di" bpmnElement="SubProcess_16ii7vk" isExpanded="true">
        <dc:Bounds x="270" y="326" width="551" height="200" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="StartEvent_0hmj9us_di" bpmnElement="StartEvent_0hmj9us">
        <dc:Bounds x="299" y="400" width="36" height="36" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="SequenceFlow_0k9gw4m_di" bpmnElement="SequenceFlow_0k9gw4m">
        <di:waypoint x="335" y="418" />
        <di:waypoint x="385" y="418" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="SequenceFlow_0awtesr_di" bpmnElement="SequenceFlow_0awtesr">
        <di:waypoint x="485" y="418" />
        <di:waypoint x="535" y="418" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNShape id="EndEvent_1sgs88n_di" bpmnElement="EndEvent_1sgs88n">
        <dc:Bounds x="685" y="400" width="36" height="36" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="SequenceFlow_1f0yvsl_di" bpmnElement="SequenceFlow_1f0yvsl">
        <di:waypoint x="635" y="418" />
        <di:waypoint x="685" y="418" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="SequenceFlow_1n4omi3_di" bpmnElement="SequenceFlow_1n4omi3">
        <di:waypoint x="292" y="161" />
        <di:waypoint x="292" y="244" />
        <di:waypoint x="546" y="244" />
        <di:waypoint x="546" y="326" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNShape id="EndEvent_1hb267s_di" bpmnElement="EndEvent_1hb267s">
        <dc:Bounds x="871" y="408" width="36" height="36" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="SequenceFlow_0u0dpn4_di" bpmnElement="SequenceFlow_0u0dpn4">
        <di:waypoint x="821" y="426" />
        <di:waypoint x="871" y="426" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNShape id="UserTask_063tw82_di" bpmnElement="Task_0zfgdnv">
        <dc:Bounds x="385" y="378" width="100" height="80" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="UserTask_01eg16s_di" bpmnElement="Task_0fl5f96">
        <dc:Bounds x="535" y="378" width="100" height="80" />
      </bpmndi:BPMNShape>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</bpmn:definitions>

Can someone help me on how to deserialize the task variable in embedded form or am i missing something here?

Any help is much appreciated.