[QGIS-Developer] QgsComposition.getComposerItemById returns wrong object

[Enrico Ferreguti]

I'm trying to set programmatically a QgsComposerPicture content in QGIS2.99:

1) I create a new print composition and I name it 'test'
2) I create a picture frame in the composition and I call it 'picture'
3) I run the following code:

from qgis.core import QgsProject
myComposition =
QgsProject.instance().layoutManager().compositionByName('test')
myComposerPicture = myComposition.getComposerItemById("picture")
myComposerPicture.setPicturePath("[path to an image]")

and I get the following Exception:
AttributeError: 'QgsComposerItem' object has no attribute 'setPicturePath'

If I inspect myComposerPicture object I found it is a
qgis._core.QgsComposerItem not a QgsComposerPicture

Is this a correct behaviour or is it an issue?
Should I open a issue ticket?
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