workspace creation broken after upgrade from 15.x to 16.2

• Error
• Regression

I've been using for many semesters this workspace template (See below) which allowed me to create a bunch of pages, groups, category, and a few other objects. I've recently updated to 16.2svn , attempted to create the new workspace "2017a Spring" for this new semester based on this same template, and so far I saw that only the default group Courses:_:2017a Spring was created and not the two subgroups "Courses:_:2017a Spring Faculty" and "Courses:_:2017a Spring Students".

So something is borked, and I presume that other parts of the workspace where not created properly (untested yet)

---
objects: 
  - 
    type: categorize
    data: 
      type: wiki_page
      object: $50f320f6d7ffe
      categories: 
        - $profilerequest:category$undefined$
  - 
    type: wiki_page
    ref: 50f320f6d7ffe
    data: 
      name: $profilerequest:namespace$undefined$
      namespace: 
      content: 
  - 
    type: categorize
    data: 
      type: wiki_page
      object: $50f320f6d822c
      categories: 
        - $profilerequest:category$undefined$
  - 
    type: wiki_page
    ref: 50f320f6d822c
    data: 
      name: Sessions
      namespace: $profilerequest:namespace$undefined$
      content: 
      structure: 0
  - 
    type: categorize
    data: 
      type: wiki_page
      object: $50f320f6d82c4
      categories: 
        - $profilerequest:category$undefined$
  - 
    type: wiki_page
    ref: 50f320f6d82c4
    data: 
      name: Menu
      namespace: $profilerequest:namespace$undefined$
      content: 
  - 
    type: categorize
    data: 
      type: wiki_page
      object: $50f320f6d8383
      categories: 
        - $profilerequest:category$undefined$
  - 
    type: wiki_page
    ref: 50f320f6d8383
    data: 
      name: Final Paper
      namespace: $profilerequest:namespace$undefined$
      content: 
      structure: 0
  - 
    type: categorize
    data: 
      type: wiki_page
      object: $reffinalpapertemplate
      categories: 
        - $profilerequest:category$undefined$
  - 
    type: wiki_page
    ref: reffinalpapertemplate
    data: 
      name: Final Paper Template
      namespace: $profilerequest:namespace$undefined$
      content: 
  - 
    type: categorize
    data: 
      type: forum
      object: $forumref
      categories: 
        - $profilerequest:category$undefined$
  - 
    type: forum
    ref: forumref
    data: 
      name: Main forum
      namespace: $profilerequest:namespace$undefined$
      attachments: everyone
      list: [ topic_reads ]
      content: 
mappings: 
  Base: $profilerequest:group$undefined$
  Students: >
    $profilerequest:group$undefined$
    Students
  Faculty: $profilerequest:group$undefined$ Faculty
permissions: 
  Base: 
    description: $profilerequest:group$undefined$
    autojoin: y
    objects: 
      - 
        type: category
        id: $profilerequest:category$undefined$
        allow: 
          - admin_categories
          - add_object
          - remove_object
          - post_comments
          - read_comments
          - download_files
          - upload_files
          - view_file_gallery
          - edit_gallery_file
          - view_fgal_explorer
          - view_fgal_path
          - forum_edit_own_posts
          - forum_post
          - forum_post_topic
          - forum_read
          - forum_vote
          - view_freetags
          - freetags_tag
          - unassign_freetags
          - group_view
          - group_view_members
          - group_add_member
          - group_remove_member
          - perspective_view
          - view_sheet
          - view_sheet_history
          - tracker_view_attachments
          - tracker_view_comments
          - create_tracker_items
          - tracker_view_ratings
          - tracker_vote_ratings
          - tracker_revote_ratings
          - view_trackers
          - view
          - edit
          - wiki_view_history
          - edit_structures
          - rename
          - rollback
          - upload_picture
          - wiki_view_comments
          - wiki_view_source
          - site_report
          - modify_object_categories
      - 
        type: group
        id: Base
        allow: 
          - group_view
          - group_view_members
          - group_add_member
          - group_remove_member
      - 
        type: group
        id: Students
        allow: 
          - group_view
          - group_view_members
          - group_add_member
          - group_remove_member
      - 
        type: group
        id: Faculty
        allow: 
          - group_view
          - group_view_members
          - group_add_member
          - group_remove_member
  Students: 
    description: >
      $profilerequest:group$undefined$
      Students
    objects: 
      - 
        type: category
        id: $profilerequest:category$undefined$
        allow: 
          - admin_categories
          - add_object
          - remove_object
          - post_comments
          - read_comments
          - edit_gallery_file
          - forum_edit_own_posts
          - forum_post
          - forum_post_topic
          - forum_read
          - forum_vote
          - view_freetags
          - freetags_tag
          - unassign_freetags
          - edit_sheet
          - view_sheet
          - view_sheet_history
      - 
        type: group
        id: Base
        allow: 
          - group_view
          - group_view_members
      - 
        type: group
        id: Students
        allow: 
          - group_view
          - group_view_members
      - 
        type: group
        id: Faculty
        allow: 
          - group_view
          - group_view_members
  Faculty: 
    description: $profilerequest:group$undefined$ Faculty
    autojoin: y
    objects: 
      - 
        type: category
        id: $profilerequest:category$undefined$
        allow: 
          - admin_categories
          - view_category
          - add_object
          - remove_object
          - assign_perm_category
          - post_comments
          - read_comments
          - admin_comments
          - edit_comments
          - remove_comments
          - dsn_query
          - admin_file_galleries
          - assign_perm_file_gallery
          - batch_upload_files
          - create_file_galleries
          - edit_gallery_file
          - remove_files
          - admin_forum
          - forum_attach
          - forum_autoapp
          - forum_edit_own_posts
          - forum_post
          - forum_post_topic
          - forum_read
          - forums_report
          - forum_vote
          - view_freetags
          - admin_freetags
          - freetags_tag
          - unassign_freetags
          - broadcast
          - perspective_edit
          - perspective_admin
          - admin_sheet
          - edit_sheet
          - view_sheet
          - view_sheet_history
          - admin_trackers
          - attach_trackers
          - tracker_view_attachments
          - comment_tracker_items
          - modify_tracker_items
          - modify_tracker_items_pending
          - modify_tracker_items_closed
          - remove_tracker_items
          - remove_tracker_items_pending
          - remove_tracker_items_closed
          - tracker_view_ratings
          - view_trackers_closed
          - view_trackers_pending
          - watch_trackers
          - export_tracker
          - admin_wiki
          - assign_perm_wiki_page
          - lock
          - remove
          - use_as_template
          - wiki_view_ref
          - wiki_admin_attachments
          - wiki_attach_files
          - wiki_view_attachments
          - workspace_instantiate
      - 
        type: group
        id: Base
        allow: 
          - group_view
          - group_view_members
      - 
        type: group
        id: Students
        allow: 
          - group_view
          - group_view_members
      - 
        type: group
        id: Faculty
        allow: 
          - group_view
          - group_view_members

This bug has been demonstrated on show2.tiki.org

Please demonstrate your bug on show2.tiki.org