RecyclerView is not going to the orignal starting position

recently I have added saving and restoring functionality in my recycler view so when I navigate between different fragments the recycler view maintains its position when I come back but now there is an issue when I click the fragment again I think the recycler view should go to the top of the original starting position but no it is maintaining the same position and I have to go manually by scroll down(to go to the top) also I want that when recycler view is going to the original top position it shows the entire scroll just like Instagram but fast

Here is my Code

Note:- if anyone wants more references for my code please tell me I will update the question

Home_Fragment.java // the implementation of saving and restoring the position is in the last so you can skip to the last if you want to

@SuppressLint("SourceLockedOrientationActivity")
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home, container, false);
        requireActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        MaterialToolbar materialToolbar = view.findViewById(R.id.toolbar);
        materialToolbar.setOnMenuItemClickListener(toolbarItemClickListener);
        postRecyclerView = view.findViewById(R.id.recyclerViewHome);
        shimmerFrameLayout = view.findViewById(R.id.shimmerEffect);
//        this is for one item per scroll
//        SnapHelper snapHelper = new PagerSnapHelper();
//        snapHelper.attachToRecyclerView(verticalRecyclerView);
        postRecyclerView.setAdapter(postsAdapter);
//        listState = savedInstanceState.getParcelable("ListState");

        StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(1, StaggeredGridLayoutManager.VERTICAL);
        postRecyclerView.setLayoutManager(
                staggeredGridLayoutManager
        );
        postRecyclerView.setItemAnimator(null);
        getData();


        postRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {

                visibleItemCount = staggeredGridLayoutManager.getChildCount();
                totalItemCount = staggeredGridLayoutManager.getItemCount();
                int[] firstVisibleItems = null;
                firstVisibleItems = staggeredGridLayoutManager.findFirstVisibleItemPositions(firstVisibleItems);
                if (firstVisibleItems != null && firstVisibleItems.length > 0) {
                    pastVisibleItems = firstVisibleItems[0];
                }

                if (loading) {
                    if ((visibleItemCount + pastVisibleItems) >= totalItemCount) {
                        loading = false;
                        getData();
                        Log.d("tag", "LOAD NEXT ITEM");
                    }
                }
            }
        });
//        setupFirebaseAuth();
        shimmerFrameLayout.startShimmer();
        mUploads = new ArrayList<>();
        postsAdapter = new PostAdapter_Home(getContext(), mUploads);
        postRecyclerView.setAdapter(postsAdapter);
        postRecyclerView.scrollToPosition(Home_Fragment.saved_position);
        return view;
    }


    private void getData() {
        databaseReference.addValueEventListener(new ValueEventListener() {
            @SuppressLint("NotifyDataSetChanged")
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                if (snapshot.exists()) {
                    shimmerFrameLayout.stopShimmer();
                    shimmerFrameLayout.setVisibility(View.GONE);
                    postRecyclerView.setVisibility(View.VISIBLE);
                    mUploads.clear();
                    for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
                        Upload upload = dataSnapshot.getValue(Upload.class);
                        assert upload != null;
                        upload.setmKey(dataSnapshot.getKey());
                        mUploads.add(upload);


                    }

                }
                postsAdapter.setUploads(mUploads);

                //notify the adapter
                postsAdapter.notifyDataSetChanged();
                loading = true;
            }


            @Override
            public void onCancelled(@NonNull DatabaseError error) {
                loading = true;
            }
        });
    }
 @Override
    public void onPause() {
        super.onPause();

        mBundleRecyclerViewState = new Bundle();

        mListState = postRecyclerView.getLayoutManager().onSaveInstanceState();

        mBundleRecyclerViewState.putParcelable(KEY_RECYCLER_STATE, mListState);
    }

    @Override
    public void onResume() {
        super.onResume();

        if (mBundleRecyclerViewState != null) {
            new Handler().postDelayed(new Runnable() {

                @Override
                public void run() {
                    mListState = mBundleRecyclerViewState.getParcelable(KEY_RECYCLER_STATE);
                    postRecyclerView.getLayoutManager().onRestoreInstanceState(mListState);

                }
            }, 50);
        }
    }


    public void onStop() {

        super.onStop();
//        if (mAuthListener != null) {
//            mAuth.removeAuthStateListener(mAuthListener);
//        }
    }
}

from RecyclerView is not going to the orignal starting position