using System.Runtime.CompilerServices;
var owner = new Holder();
GC.Collect(2, GCCollectionMode.Forced, blocking: true, compacting: true);
Console.WriteLine($"owner-before:{GC.GetGeneration(owner)}");
Install(owner);
GC.Collect(0, GCCollectionMode.Forced, blocking: true);
Console.WriteLine($"child-alive:{owner.Child is not null};child-generation:{GC.GetGeneration(owner.Child!)}");
owner.Child = null;
Console.WriteLine($"owner-empty:{owner.Child is null}");
GC.KeepAlive(owner);
[MethodImpl(MethodImplOptions.NoInlining)] static void Install(Holder h) => h.Child = new byte[1024];
sealed class Holder { public byte[]? Child; }