Does SwiftUI cache images in memory?

I have a VStack of views where each view contains an ArtworkView:

struct ArtworkView: View {
  let artworkId: UInt64
  @State private var uiImage: UIImage?
  @Environment(\.scenePhase) var scenePhase

  @ViewBuilder var imageView: some View {
    if let uiImage = uiImage {
      Image(uiImage: uiImage)
    }
    else {
      Image(systemName: "photo").opacity(0.4)
    }
  }

  var body: some View {
    imageView
      .onAppear() {
        loadArtwork(withId: artworkId) {
          uiImage = $0
        }
      }
      .onChange(of: scenePhase) { scenePhase in
        if scenePhase == .background {
          uiImage = nil
        }
      }
  }
}

At first sight it works as expected – images appear on launch and disappear upon transition to the background.

But when I profile with Instruments > Allocations there is no difference in memory usage between foreground and background. And I need images to be unloaded from memory in background.

Does SwiftUI VStack or Image cache underlying UIImage objects and if so, how to opt out of it?