SwiftUI List accesses all items at once using custom RandomAccessCollection - list

Question

I am currently facing an issue using Dave DeLong's #Query where all elements are accessed at once (adding a print-statement to the subscript function) in the beginning. I have broken down the problem and I am still facing this issue without using Core Data or anything related to Dave DeLong's solution.
I have a simple List:
struct ContentView: View {
var items = ItemCollection()
var body: some View {
NavigationView {
List {
ForEach(items) { item in
Text("Item at \(item.timestamp!)")
}
}
}
}
}
And a custom collection:
struct ItemCollection: RandomAccessCollection {
private let results: [ItemModel] = (0...100).map { _ in ItemModel(timestamp: .now) }
public var count: Int { results.count }
public var startIndex: Int { 0 }
public var endIndex: Int { count }
public subscript(position: Int) -> ItemModel {
print("access at \(position)")
return results[position]
}
}
I understand that all ItemModels are created in the beginning, that's not the issue. However, running this app prints out "access at #" multiple times from 0 to 100.
access at 0
access at 1
access at 2
access at 3
access at 4
...
access at 97
access at 98
access at 99
access at 100
I would think that List only accesses the visible (and a few more) rows?
An interesting observation I did was when I am using the indices in the ForEach instead of the items itself:
ForEach(items.indices, id: \.self) { index in
Text("Item at \(items[index].timestamp!)")
}
This solves the problem and only the first 9 elements are accessed (although they're accessed twice).
access at 0
access at 0
access at 1
access at 1
access at 2
access at 2
...
access at 7
access at 7
access at 8
access at 8
access at 9