Copying document type breaks adding new fields

I copied document type. I tried to add new fields to that type but they are not visible in the document type editor.

Please see the attached video file.

The following log entries are produced. They show up while editing new type but they mention name of the old type.

[INFO] [talledLocalContainer] 24.02.2014 10:36:20 WARN [org.hippoecm.frontend.editor.plugins.field.FieldPluginHelper.<init>():73] Could not find field with name properties_property in connect:videobanner; has the field been added without committing the type?
[INFO] [talledLocalContainer] 24.02.2014 10:36:24 WARN [org.hippoecm.frontend.editor.plugins.field.FieldPluginHelper.<init>():73] Could not find field with name properties_property in connect:videobanner; has the field been added without committing the type?
[INFO] [talledLocalContainer] 24.02.2014 10:36:24 WARN [org.hippoecm.frontend.editor.plugins.field.FieldPluginHelper.<init>():73] Could not find field with name properties_property in connect:videobanner; has the field been added without committing the type?