Obj->parent is 0

I run deepstream-app with this pipeline pgie->tracker->sgie(detector)->dsexample, i add a probe in src pad of sgie to process output metadata. At this point, i still get the correct obj->parent but in dsexample, it is 0 for all object. Could you explain the issue please ?
• DeepStream Version6.0.1

According to deepstream-app source code, the dsexample is not connected to sgie directly. The pipeline is as the attached picture.
Please write your own app to construct the pipeline as you like.
play.zip (2.9 MB)

glad to know

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