Documents imported with Office importer are not recognised as children

Steps to reproduce:
1. Make sure to start the Office Server from the Admininstration -> Content -> Office Server
2. Create a new page for clear results: Foo.WebHome and set it's content to

{{velocity}}
$doc.children
OR
{{children/}}
{{/velocity}}

3. Create a page Bar in the Foo space -> Foo.Bar.WebHome
4. Create a page Baz with the option to import from Office and select an Office file from the system.

Expected result:
In Foo.WebHome page, both Foo.BarWebHome and Foo.BazWebHome are listed.
Actual result:
Only Foo.Bar.WebHome is displayed.

However, both pages can be retrieved with

$services.query.xwql("where doc.space like '${doc.space}.%'").execute()