[.net] Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths - why?

Anybody wondering how to do it in EF core:

      protected override void OnModelCreating(ModelBuilder modelBuilder)
            {
                foreach (var relationship in modelBuilder.Model.GetEntityTypes().SelectMany(e => e.GetForeignKeys()))
                {
                    relationship.DeleteBehavior = DeleteBehavior.Restrict;
                }
           ..... rest of the code.....

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