UE5 my custom Livelink source send data to UE worked in PIE, but after packaging it not work

General Feedback & Requests
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I am sending data from python though a local url and port to UE. The Livelink can receive data in PIE, it works and can control my MetaHumans.

But when packing, sending data not work.

How to fix it?

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the llv device is my device sending data from python, mimic behavior as iPhone’s camera.

Why packing won’t work in this?