ManagedAtomic doesn't seem to work in test-cases

[ThrudTheBarbarian]

If I have an I-var of a ManagedAtomic in a Swift framework, and then set up a test case in the same Xcode project, in the associated test target created by Xcode. Even importing "@testable" won't let me extend the class that contained the ManagedAtomic. It returns

"Cannot inherit from class 'QSEntity' because it has overridable members that could not be loaded"

Information

• Package version: 1.2.0
• Platform version: MacOS 14.3 (23D56)
• Swift version:

swift-driver version: 1.87.3 Apple Swift version 5.9.2 (swiftlang-5.9.2.2.56 clang-1500.1.0.2.5)
Target: arm64-apple-macosx14.0

Checklist

• [X] If possible, I've reproduced the issue using the main branch of this package.
• [X] I've searched for existing reports of the same issue.

Steps to Reproduce

• Set up a Swift framework project
• Include the ManagedAtomics package using the package manager
• Have a class with the following:

/*****************************************************************************\
|* Class definition
\*****************************************************************************/
class QSEntity : NSObject
	{
        ...
	/*************************************************************************\
	|* Model handling
	\*************************************************************************/
	private var nextModelIdValue : ManagedAtomic<Int64>	// Table's next model-id
        ...
        }

• Set up a class in the associated tests project which imports the framework and extends the above Entity class

import Foundation
import OSLog
@testable import QuickSilver

/*****************************************************************************\
|* Class definition
\*****************************************************************************/
class TestEntity : QSEntity
        {
        }

Expected behavior

I'd expect a class containing a ManagedAtomic as an i-var to be importable into another class in the associated test target

Actual behavior

• Set up as above
• Notice that the error message Cannot inherit from class 'QSEntity' because it has overridable members that could not be loaded appears on the TestEntity declaration line.
• Comment out the ManagedAtomic from the QSEntity class, ignoring any compilation issues where you've used it (for now)
• Notice that the "Cannot inherit..." error goes away