This program creates the following EF model:

 Blog
  |   1..1
 Post
 /|\  1..m
Image

Then performs the following operations:

1. Create a new Blog with a Post titled "A"
2. Fetch the Blog, replace its Post with a new entity titled "B", and then add an Image to the Post
3. Fetch the Post and display its title

The fetched Post title should be "B" but is "A".

1. Create the database:

   dotnet tool install --global dotnet-ef
   dotnet ef migrations add InitialCreate
   dotnet ef database update
   

2. Run the app:

   dotnet run
   

   And it incorrectly outputs:

    Blog post title = A
   

3. Uncomment the line:

    // var _ = blog.Post;
   

4. Re-run the app and it correctly outputs:

    Blog post title = B
   

• #23757 Lazy one-to-one entity changes lost when invoking navigation property