"Java-gradle" workspace migrated from CRW 2.15 to DS 3.0 had failed to start because of duplicate volume found in devfile

Error processing devfile: failed to merge DevWorkspace volumes: duplicate volume found in devfile: m2

schemaVersion: 2.1.0
metadata:
  name: java-gradle-mugn
  namespace: admin-codeready
projects:
  - name: validating-form-input
    zip:
      location: 'http://devfile-registry.openshift-workspaces.svc:8080/resources/java-gradle-validating-form-input-master.zip'
components:
  - attributes:
      app.kubernetes.io/name: gradle
      che-theia.eclipse.org/vscode-extensions:
        - 'http://plugin-registry.openshift-workspaces.svc:8080/resources/github_com/redhat-developer/devspaces-vscode-extensions/releases/download/7_44-che-assets/java-0.82.0-369.vsix'
        - 'http://plugin-registry.openshift-workspaces.svc:8080/resources/github_com/redhat-developer/devspaces-vscode-extensions/releases/download/7_44-che-assets/vscode-java-debug-0.26.0.vsix'
        - 'http://plugin-registry.openshift-workspaces.svc:8080/resources/open-vsx_org/api/vscjava/vscode-java-test/0_28_1/file/vscjava.vscode-java-test-0.28.1.vsix'
      che-theia.eclipse.org/vscode-preferences:
        java.server.launchMode: Standard
    container:
      args:
        - sh
        - '-c'
        - '${PLUGIN_REMOTE_ENDPOINT_EXECUTABLE}'
      endpoints:
        - exposure: public
          name: input-form-endpoint
          protocol: http
          targetPort: 8080
      env:
        - name: GRADLE_USER_HOME
          value: /home/jboss/.gradle
        - name: JAVA_OPTS
          value: '-XX:MaxRAMPercentage=50 -XX:+UseParallelGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xms20m -Djava.security.egd=file:/dev/./urandom'
        - name: JAVA_TOOL_OPTIONS
          value: $(JAVA_OPTS)
        - name: HOME
          value: /home/jboss
        - name: PLUGIN_REMOTE_ENDPOINT_EXECUTABLE
          value: /remote-endpoint/plugin-remote-endpoint
        - name: THEIA_PLUGINS
          value: 'local-dir:///plugins/sidecars/gradle'
        - name: CHE_DASHBOARD_URL
          value: 'https://devspaces-openshift-workspaces.apps.ocp410-oshmara.crw-qe.com'
        - name: CHE_PLUGIN_REGISTRY_URL
          value: 'https://devspaces-openshift-workspaces.apps.ocp410-oshmara.crw-qe.com/plugin-registry/v3'
        - name: CHE_PLUGIN_REGISTRY_INTERNAL_URL
          value: 'http://plugin-registry.openshift-workspaces.svc:8080/v3'
      image: 'registry.redhat.io/codeready-workspaces/plugin-java11-rhel8@sha256:79b59596870382e968850bc241ac41a3345a9079f28251808e35479f92bd3b86'
      memoryLimit: 640Mi
      mountSources: true
      sourceMapping: /projects
      volumeMounts:
        - name: gradle-volume
          path: /home/jboss/.gradle
        - name: m2
          path: /home/user/.m2
        - name: m2
          path: /home/user/.m2
        - name: remote-endpoint
          path: /remote-endpoint
        - name: plugins
          path: /plugins
    name: gradle
  - name: gradle-volume
    volume: {}
  - name: m2
    volume: {}
  - name: m2
    volume: {}
commands:
  - exec:
      commandLine: gradle build
      component: gradle
      label: 1. Build
      workingDir: '${PROJECTS_ROOT}/validating-form-input/complete'
    id: build
  - exec:
      commandLine: gradle bootRun
      component: gradle
      label: 2. Run application
      workingDir: '${PROJECTS_ROOT}/validating-form-input/complete'
    id: run-application
  - exec:
      commandLine: gradle bootRun --debug-jvm
      component: gradle
      label: 3. Run in debug mode
      workingDir: '${PROJECTS_ROOT}/validating-form-input/complete'
    id: run-in-debug-mode
  - exec:
      commandLine: gradle test
      component: gradle
      label: 4. Run tests
      workingDir: '${PROJECTS_ROOT}/validating-form-input/complete'
    id: run-tests