Bundle resource path is good; resource URL is nil

Narrative first, exhibits later…

Bundle calls that had previously gotten a resource URL from my iOS app's bundle now gets only nil. There is no Bundle or URL call that will return anything but nil. The file is conclusively present.

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Environment

Xcode 11.7, targeting iOS 13.3, SwiftUI, Core Data (store deleted, coordinator reinitialized, obtained a moc, no change to the store).

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Approach

I need to reconstruct my data, so I want to read a not-insanely-large JSON file. Before installing Xcode 11.7, this was no problem: Bundle would give me a URL for the file, nothing remarkable. That version of the read appears in the listing below after the /***...***/ line.

I'd let the project sit for a couple of weeks, during which I installed Xcode 11.7. (I'm allowing for the new version being a red herring.)

Now, Bundle$url(forResource:withExtension:) returns nil. I tried a number of workarounds and double-checks: The file is there, Bundle will supply a path string.

The path works, so I have a workaround, but this bothers me.

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What I checked

• Bundle$path(forResource:ofType:) returns a path that proves valid on the command line and in Finder.

• Data can be recovered from that path.

• Opening the .app package in Finder shows a file of that name in the top level of the package.

• Same with the command line.

• expr try FileManager.default.contentsOfDirectory(atPath: Bundle.main.bundlePath) on the LLDB command line shows the file name in the list. The file is there.

• There was no way to initialize a URL from the path, URL(fileURLWithPath:), trying to get a URL for the bundle path… everything I could think of. Always nil.

• Deleting all Simulator devices under ~Library did nothing.

• Neither did removing and restoring the iPhone 8 simulator in the Devices and Simulators window.

• Nor deleting DerivedData.

• I routinely do sudo xcrun xcode-select -s /Applications/Xcode.app whenever I install a new Xcode.

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Remaining confounders

• When 11.7 opened the project, it downloaded and installed the Swift packages for Alamofire and KDTree.

• The .app name has a space in it. Astonishing regression if that's it.

• I haven't tried reproducing this in a fresh project, or the like. Gotta stop some time.

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Code

Code Block 
let countyMetadata: [CountyWithCentroid] = {
    var stage = "Path"
    do {
        let vanillaDecoder = JSONDecoder()
/****************** DOES WORK ******************/
        let pCentroidPath = Bundle.main
            .path(forResource: 
                      "WithGeometryAndPopulation", 
                     ofType: "json")   
                   // =>   
/*
/Users/fritza/Library/Developer/CoreSimulator/Devices/65C9CC3A-9A49-4131-BF4C-535702B73559/data/Containers/Bundle/Application/908E5688-04A5-417B-BF4B-3C482735E25B/County Trends.app/WithGeometryAndPopulation.json
*/
        let pData = FileManager.default
                    .contents(atPath: pCentroidPath!)
                   // =>  1_585_677 bytes
        let pCentroidRecords = try vanillaDecoder
            .decode([CountyWithCentroid].self, 
                               from: pData!)
                   // =>  3140 elements
/******************* HAD WORKED ******************/
        stage = "URL"
        let cCentroidURL = Bundle.main
             .url(forResource:
                         "WithGeometryAndPopulation", 
                  withExtension: "json")  
                   // =>   nil
        let cCentroidData = try Data(contentsOf: cCentroidURL!)
                   // =>   Dereference of nil.
        let cCentroidRecords = try vanillaDecoder
            .decode([CountyWithCentroid].self, from: cCentroidData)
        return cCentroidRecords
    }
    catch {
    // ...
    }
    return []
}()