List entries / section leaks memory, says Instruments

Hello all,

I currently encounter a strange issue in my app which I also can reproduce in a minimal example. Lets say we just have an application with this code:

// ContentView.swift

var body: some View {
    NavigationSplitView {
        List {
            Section("Header") {
                Text("Text")
            }
        }
    } detail: {
    }
}

Running the app just works fine but running it in Instruments results in a memory leak at object NSMutableIndexSet. Why is that?

Taking a more complex example where the view is refreshed based on the result of a function, it leaks even more increasing memory usage. Example code:

var body: some View {
    NavigationSplitView {
        List {
            Section("Header") {
                ForEach(someClass?.functionReturningArrayOfStrings() ?? [String](), id: \.self) { item in
                    Text(item)
                }
            }
        }
    } detail: {

    }
}

Removing either the Sectionor the entries like Textfixes the memory leak, according to Instruments. Is this a bug I stumbled upon or something I misunderstood here?

I also opened a bug report for now, number is: 12388668

Kind regards,

Jan