UIImage imageNamed: sometimes returns nil

Number:rdar://6121449 Date Originated:June 4, 2019
Status:Open Resolved:
Product:UIKit Product Version:
Classification: Reproducible:YES
-  have an image in the application bundle
 - in a background thread use imagedNamed: to access the image
 - background the app. 
 imageNamed should never return nil for images that are bundled with the app 
 sometimes it returns nil when access on a background thread when the app is backgrounded. Be aware - I am using the word "background" twice in two different contexts - it is not a mistake or confusion. 
Note: this does not seem to reproduce when using initWithContentsOfFile:
 this does not seem to reproduce when the images are stored in a asset catalog 
We talked to Tony from the foundation team about this at WWDC 2019


a sample project that demonstrates this bug can be found here: https://github.com/jon513/UIImageImageNamedBug

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