Fix selection for field of type 'Document' in spreadsheet editor

When editing a cell of type Document in the spreadsheet editor, the suggestion widget never suggest any document and the spinner turns endlessly:

How to reproduce:

• in Studio Modeler define a document type named DocType1 (that extends nothing) and add to it a field named docref of type Document
• define its create layout to input field doctype1:docref
• define a content view named cv1:
  • set Query filter to ecm:mixinType != 'HiddenInNavigation' AND ecm:isVersion = 0 AND ecm:currentLifeCycleState != 'deleted' AND ecm:parentId = ?
  • add a query parameter with value

    #{currentDocument.id}

  • add a result column Document Id title with link
  • add a result column with a widget by property for field doctype1:docref
• define another document type named DocType2 that extends Folder:
  • check Show Create Child Action
  • set document type DocType1 as a child document type
  • set the Main content content view to cv1
• deploy and log in the Nuxeo platform
• create a folderish document of type DocType2
• create a document of type DocType1 under it and set its doctype1:docref to any other document
• navigate back to the listing of the folderish document of type DocType2
• click on the content view's Spreadsheet icon to open the spreadsheet editor
• double-click on any cell in column Docref to switch to edit mode and select a document

Expected result: the suggestion widget displays documents based on the entered characters.
Actual result: the suggestion widget does not display any documents based on the entered characters.