22107245: Xcode 7 beta 4 (7A165t) Interface Builder ignores background color set on UITableView

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Description

Summary:
Table views instantiated from XIB files and Storyboards compiled using Interface Builder in Xcode 7 beta 4 (7A165t) have white (default) background at runtime, regardless of background color set for them in Interface Builder. This issue happens when running any iOS version on device/simulator.

Steps to Reproduce:

1. Create an empty app with a view controller that manages a view with a table view, using a XIB file or Storyboard to construct the interface.
2. Set table view color to red in Interface Builder, without changing anything in code.
3. Run the app.

Expected Results:
Table view has a red background (apart from the area covered by cells).

Actual Results:
Table view has a white (default) background color.

Version:
Xcode 7 beta 4 (7A165t) running OS X 10.10.4 (14E46)

Notes:
This is a regression from previous Xcode versions. I have no information regarding whether it appeared in Xcode 7 beta 4 or in earlier seeds. A workaround for this issue is to set the background color manually in code, but that's kinda missing the point of Interface Builder.
The attached project demonstrates the issue.

Configuration:
Any device or simulator.

Attachments:
'TableBackgroundColorDemo.zip' was successfully uploaded.

Product Version: Xcode 7 beta 4 (7A165t) running OS X 10.10.4 (14E46)
Created: 2015-08-02 09:57:59.807740
Originated: 2015-08-02T00:00:00
Open Radar Link: http://www.openradar.me/22107245