RSRP-288357: Incorrect refactoring using object initializer

I have the following code in a builder class:

        public HashLogBuilder WithFolder(string folder, string extension, bool recursive)
        {
            var builder = new HashLogBuilder();
            builder._folders = new List<FolderDescription>(_folders);
            builder._folders.Add(new FolderDescription{Folder = folder, Extension = extension, Recursuve = recursive});
            builder._bytes = _bytes;
            return builder;
        }

The new keyword for the new HashlogBuilder suggests to use an object initializer. However when applied, this looses the additional line which adds a new folder:

        public HashLogBuilder WithFolder(string folder, string extension, bool recursive)
        {
            var builder = new HashLogBuilder {_folders = new List<FolderDescription>(_folders), _bytes = _bytes};
            return builder;
        }