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It seems evaluation of @atlas_geometry is always 'null'

test code:

exp = QgsExpression('if(@atlas_geometry is null,1,0)') // always returns 1
rq = QgsFeatureRequest(exp)

@atlas_geometry within layer's expressions seems work fine though.

I have to do double spatial filtering across two layers so I come up with writing a predicate in PyQGIS for using in layer expression. Unfortunately it seems @atlas_geometry always returns null in my python code, despite it works fine in layer expression.

Can I access @atlas_geometry in my python code as if it's in layer's expression?

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