[QGIS-Developer] Does QgsProject.instance().createEmbeddedGroup() work?

[Alister Hood]

Hi, I want to programmatically embed a project, like I can in the gui with
"Layer>embed layers and groups."

I thought QgsProject.instance().createEmbeddedGroup() was what I needed,
but it doesn't seem to work - see below.  Am I completely off track, or is
it broken?

Thanks.

path='/home/alister/testtoembed.qgs'
project = QgsProject.instance()
project.read(path)
True
project.clear()
newGroup = QgsLayerTreeGroup()
type(newGroup)
<class 'qgis._core.QgsLayerTreeGroup'>
newGroup = QgsProject.instance().createEmbeddedGroup('test', path, [])
type(newGroup)
<class 'NoneType'>
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