System.InvalidOperationException: Collection was modified; enumeration operation may not execute. O

Question

StateLayoutController.SwitchToContent (System.Boolean animate)

C:\Users\xxxx.yyyyy\source\repos\mobile-app\src\App\Views\StateLayout\StateLayoutController.cs, line 51

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

Here is the content of the method in question:

        public async void SwitchToContent(bool animate)
        {
            if (!layoutWeakReference.TryGetTarget(out var layout))
                return;

            var token = RebuildAnimationTokenSource(layout);

            previousState = LayoutState.None;
            await ChildrenFadeTo(layout, animate, true);

            if (token.IsCancellationRequested)
                return;

            // Put the original content back in.
            layout.Children.Clear();

            var itemsToAdd = new List<View>(originalContent.Count);
            foreach (var item in originalContent)
            {
                item.Opacity = animate ? 0 : 1;
                itemsToAdd.Add(item);
            }

            for (int i = itemsToAdd.Count - 1; i >= 0; i--)
            {
                layout.Children.Insert(i, itemsToAdd[i]);
            }

            await ChildrenFadeTo(layout, animate, false);
        }

What I've tried so far, nothing seems to work:
-Using .ToList()
-Using Thread.Delay
-Changing the foreach loop into a reverse for loop (as shown above)

• Using locks
• Using Device.BeginInvokeOnMainThreadAsync
  -Tried various other suggestions found online

Attached in the txt file you can see the whole log from the exception InvalidOPerationException.txt