Why is my SwiftUI sheet not triggering on a long press gesture in Map annotations?

I'm trying to let users edit properties of a selected location in a new view presented as a sheet. I have a SwiftUI Map with annotations, and I've attached a long press gesture to each annotation. However, when I long press an already selected location, nothing happens. The associated print statement in the gesture handler never executes, even though the onTapGesture works and the annotations display on selection.

Here is the relevant code:

SWIFTCopied
import SwiftUI
import MapKit

struct ContentView: View {
    @State private var userLocations = [UserLocation]()
    @State private var selectedPlace: UserLocation? = nil

    let startPosition = MapCameraPosition.region(
        MKCoordinateRegion(
            center: CLLocationCoordinate2D(latitude: 42.196, longitude: 24.747),
            span: MKCoordinateSpan(latitudeDelta: 10, longitudeDelta: 10)
        )
    )

    var body: some View {
        MapReader { proxy in
            Map(initialPosition: startPosition) {
                ForEach(userLocations) { location in
                    Annotation(location.name, coordinate: location.coordinate) {
                        Image(systemName: "star.circle")
                            .resizable()
                            .foregroundStyle(.red)
                            .frame(width: 44, height: 44)
                            .background(.white)
                            .clipShape(Circle())
                            .onLongPressGesture {
                                selectedPlace = location
                            }
                    }
                }
            }
            .onTapGesture { position in
                if let coordinate = proxy.convert(position, from: .local) {
                    let newLocation = UserLocation(
                        id: UUID(),
                        name: "New Location",
                        description: "",
                        latitude: coordinate.latitude,
                        longitude: coordinate.longitude
                    )
                    userLocations.append(newLocation)
                }
            }
            .sheet(item: $selectedPlace) { place in
                Text(place.name)
            }
        }
    }
}

The location data structure is defined in another file:

SWIFTCopied
import Foundation
import MapKit 

struct UserLocation: Codable, Equatable, Identifiable {
    let id: UUID
    var name: String
    var description: String
    var latitude: Double
    var longitude: Double
    
    var coordinate: CLLocationCoordinate2D {
        CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
    }
}

I added print statements inside the gesture handlers. The print in onTapGesture executes as expected, but nothing happens in onLongPressGesture. As a beginner in SwiftUI, I’m looking for advice on why the long press gesture is not being recognized and how to resolve this issue.