In `G4StackingAction::ClassifyNewTrack()` `aTrack->GetLogicalVolumeAtVertex()` return `NULL`,

Geant4 Version: 4.11

Hi all,
I want to get the create info of secondary particle
In G4StackingAction::ClassifyNewTrack()
aTrack->GetLogicalVolumeAtVertex() always return NULL,
however, I could use the
So what is GetLogicalVolumeAtVertex used for?

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