PanelRenderer UIReloadCallback is called twice when entering playmode

Steps to reproduce:

1. Create a new PanelRenderer component
2. Add a MonoBehaviour script that regisers the UIReloadCallback in OnEnable
3. Hit play

Actual results: The UIReloadCallback is triggered twice

Expected results: The UIReloadCallback is triggered once

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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