Bug in SwiftUI?

Hi, so I have been learning SwiftUI and writing an app. I have found out that the following code won't compile and neither Xcode shows the preview of that view. Instead Xcode will display this error message when I try to preview it:

Failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project

Just to demonstrate this issue, all MVVM code are in a single file. Here's my code:

// Model
struct WatchListModel {
	let m_id: Int
	let m_ticker_symbol: String
}
 
// View
struct WatchlistView: View {
	@ObservedObject var m_watch_list_view_model: WatchListViewModel
 
	init(watch_list_view_model: WatchListViewModel) {
		m_watch_list_view_model = watch_list_view_model
	}
 
	var body: some View {
 
		// This view is causing that issue
		List(m_watch_list_view_model.m_watch_list_model) { watch_list_model in
			Text(watch_list_model.m_ticker_symbol)
		}.onAppear(perform: {
			self.m_watch_list_view_model.populate_watch_list()
		})
	}
}
 
extension WatchlistView {
	// View model
	class WatchListViewModel: ObservableObject {
		@Published var m_watch_list_model: [WatchListModel] = []
 
		// Populate watch list
		func populate_watch_list() {
			for index in 0...10 {
				m_watch_list_model[index] = WatchListModel(m_id: index, m_ticker_symbol: "Foo")
			}
		}
	}
}
 
struct WatchlistView_Previews: PreviewProvider {
	static private var m_watch_list_view_model: WatchlistView.WatchListViewModel = .init()
	
	static var previews: some View {
		WatchlistView(watch_list_view_model: self.m_watch_list_view_model)
	}
}

I am using Xcode 12.5, though it's not the latest version. The above bug can eradicated if I remove List view and just output the contents of that array as Text view. Is there anything I can do to get around this bug?