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Cannot save converted diagram

See original GitHub issue

Describe the Bug

I opened an old diagram with activity namespace, the Modeler ask it if I want to convert to camunda namespace. After I agreed, I am not able to save this diagram.

Diagram

<?xml version="1.0" encoding="UTF-8"?>
<bpmn2:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn2="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:activiti="http://activiti.org/bpmn" id="_tWMcIPj6EeKFSL_7EmNQeA" targetNamespace="http://activiti.org/bpmn" exporter="Camunda Modeler" exporterVersion="3.0.0-0" xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd">
  <bpmn2:process id="variableProcess" isExecutable="true">
    <bpmn2:startEvent id="StartEvent_1" name="Start Event" />
  </bpmn2:process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="variableProcess">
      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_10" bpmnElement="StartEvent_1">
        <dc:Bounds x="190" y="180" width="36" height="36" />
      </bpmndi:BPMNShape>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</bpmn2:definitions>

Steps to Reproduce

Steps to reproduce the behavior:

Open the diagram
Agree to convert to camunda namespace
Try to save the diagram

Expected Behavior

The diagram is saved successfully.

Environment

OS: Windows 10
Camunda Modeler Version: 3.0.0-0

Traces

App App#triggerAction show-dialog {type: "warning", title: "Deprecated <activiti> namespace detected", buttons: Array(2), message: "Would you like to convert your diagram to the <camunda> namespace?", detail: "This will allow you to maintain execution related …Camunda BPM versions 7.4.0, 7.3.3, 7.2.6 onwards."} +5s
browser.js:183 AppParent trigger action +9s check-file-changed undefined
browser.js:183 App App#triggerAction check-file-changed undefined +4s
browser.js:183 AppParent workspace saved +340ms {files: Array(2), activeFile: -1, layout: {…}, endpoints: Array(1)}
browser.js:183 AppParent trigger action +9s save null
browser.js:183 App App#triggerAction save null +9s