View Designer ignoring schemas added through XML extension

Steps to reproduce:

• Create a custom schema in Studio, e.g. gps:
  • DecimalLatitude (String)
  • DecimalLongitude (String)
  • DecimalPosition (String)
  • exifCreateDate (String)
  • exifGPSLatitude (String)
• Add a new XML extension to add this schema to a pre-existing document type, e.g. Picture

  <require>org.nuxeo.ecm.platform.picture.coreTypes</require>
  <extension target="org.nuxeo.ecm.core.schema.TypeService" point="doctype">
  
    <doctype append="true" name="Picture">
      <schema name="gps"/>
      <schema name="la"/>    
      <schema name="maps"/>     
    </doctype>
  
  </extension>
  

• Access to View Designer
• Browse to LAYOUTS > Built-in types > Picture > Create
• Click on Configure button

View Designer is not showing the schema added through XML extension in the right menu (CATALOG > Element by field)