Back Button Duplicated when Side Menu + Nav Controller used in iOS 14

Originator:uson1x
Number:rdar://FB8433800 Date Originated:17.08.2020
Status:Open Resolved:
Product:UIKit Product Version:14
Classification:Incorrect/Unexpected Behavior Reproducible:
 
In iOS 14, when you use:
Three-column SplitViewController with UINavigationController as supplementary (old master) vc

and you
1. Open side menu
2. Push another VC into supplementary NavController without collapsing side menu
3. Then collapse side menu
Back button in supplementary UINavigationController is duplicated.

Expected result:
Back button is not duplicated.

This is tested in Xcode with Version 12.0 beta 3 (12A8169g).

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