File scrolling to top when save

The report identifies g:rustfmt_autosave and rustfmt as the trigger, but names no plugin file or test. Start by tracing the autosave formatting path in the repository and check how it handles Vim window views during a write. Reproduce with a Rust file in a vertical split and autosave enabled; done means saving preserves the file's scroll position.

Hello. I have a problem when saving file opened in vertical spit. File arbitrarily scrolls to top, it looks like something performs zt-command.
I use NeoBundle and bug reproduces whenever rust-lang/rust.vim is active and option g:rustfmt_autosave is set to 1.
This behavior looks similar to this but I have nothing about BufWritePost in my .vimrc.
I've checked that too, but let g:auto_save_in_insert_mode = 0 change nothing.

:RustInfoToFile:

rust.vim Global Variables:

let g:ftplugin_rust_source_path = v:null
let g:loaded_syntastic_rust_cargo_checker = v:null
let g:loaded_syntastic_rust_filetype = v:null
let g:loaded_syntastic_rust_rustc_checker = v:null
let g:rust_bang_comment_leader = v:null
let g:rust_cargo_avoid_whole_workspace = v:null
let g:rust_clip_command = v:null
let g:rust_conceal = v:null
let g:rust_conceal_mod_path = v:null
let g:rust_conceal_pub = v:null
let g:rust_fold = v:null
let g:rust_last_args = v:null
let b:rust_last_args = []
let g:rust_last_rustc_args = v:null
let b:rust_last_rustc_args = []
let g:rust_original_delimitMate_excluded_regions = v:null
let g:rust_playpen_url = v:null
let g:rust_prev_delimitMate_quotes = v:null
let g:rust_recent_nearest_cargo_tol = v:null
let g:rust_recent_root_cargo_toml = v:null
let g:rust_recommended_style = v:null
let g:rust_set_conceallevel = v:null
let g:rust_set_conceallevel=1 = v:null
let g:rust_set_foldmethod = v:null
let g:rust_set_foldmethod=1 = v:null
let g:rust_shortener_url = v:null
let g:rustc_makeprg_no_percent = v:null
let g:rustc_path = v:null
let g:rustfmt_autosave = 1
let g:rustfmt_autosave_if_config_present = v:null
let g:rustfmt_command = 'rustfmt'
let g:rustfmt_emit_files = 1
let g:rustfmt_fail_silently = 0
let g:rustfmt_options = ''
let g:syntastic_extra_filetypes = ['rust']
let g:syntastic_rust_cargo_fname = v:null
rustfmt 1.4.12-stable (a828ffe 2020-03-11)

rustc 1.43.0 (4fb7144ed 2020-04-20)

cargo 1.43.0 (3532cf738 2020-03-17)


VIM - Vi IMproved 8.1 (2018 May 18, compiled Oct 20 2019 21:36:50)
Included patches: 1-2188
Compiled by fort@fort-28
Huge version with GTK2 GUI.  Features included (+) or not (-):
+acl               +clientserver      +diff              +folding           +libcall           -mouse_gpm         +packages          +ruby              -tag_any_white     +vartabs           -xfontset
+arabic            +clipboard         +digraphs          -footer            +linebreak         -mouse_jsbterm     +path_extra        +scrollbind        -tcl               +vertsplit         +xim
+autocmd           +cmdline_compl     +dnd               +fork()            +lispindent        +mouse_netterm     +perl              +signs             +termguicolors     +virtualedit       +xpm
+autochdir         +cmdline_hist      -ebcdic            +gettext           +listcmds          +mouse_sgr         +persistent_undo   +smartindent       +terminal          +visual            +xsmp_interact
-autoservername    +cmdline_info      +emacs_tags        -hangul_input      +localmap          -mouse_sysmouse    +postscript        +sound             +terminfo          +visualextra       +xterm_clipboard
+balloon_eval      +comments          +eval              +iconv             +lua               +mouse_urxvt       +printer           +spell             +termresponse      +viminfo           -xterm_save
+balloon_eval_term +conceal           +ex_extra          +insert_expand     +menu              +mouse_xterm       +profile           +startuptime       +textobjects       +vreplace          
+browse            +cryptv            +extra_search      +job               +mksession         +multi_byte        -python            +statusline        +textprop          +wildignore        
++builtin_terms    +cscope            -farsi             +jumplist          +modify_fname      +multi_lang        +python3           -sun_workshop      +timers            +wildmenu          
+byte_offset       +cursorbind        +file_in_path      +keymap            +mouse             -mzscheme          +quickfix          +syntax            +title             +windows           
+channel           +cursorshape       +find_in_path      +lambda            +mouseshape        +netbeans_intg     +reltime           +tag_binary        +toolbar           +writebackup       
+cindent           +dialog_con_gui    +float             +langmap           +mouse_dec         +num64             +rightleft         -tag_old_static    +user_commands     +X11               
  system vimrc file: "$VIM/vimrc"
    user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
     user exrc file: "$HOME/.exrc"
 system gvimrc file: "$VIM/gvimrc"
   user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
      defaults file: "$VIMRUNTIME/defaults.vim"
   system menu file: "$VIMRUNTIME/menu.vim"
 fall-back for $VIM: "/usr/local/share/vim"
f-b for $VIMRUNTIME: "/usr/local/share/vim/vim81"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK  -pthread -I/usr/include/gtk-2.0 -I/usr/lib/x86_64-linux-gnu/gtk-2.0/include -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libpng16   -g -O2 -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1       
Linking: gcc   -L. -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,-E   -L/usr/local/lib -Wl,--as-needed -o vim   -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lfontconfig -lfreetype -lSM -lICE -lXpm -lXt -lX11 -lXdmcp -lSM -lICE  -lm -ltinfo -lnsl  -lselinux  -lcanberra -ldl  -L/usr/lib -llua5.1 -Wl,-E  -fstack-protector-strong -L/usr/local/lib  -L/usr/lib/x86_64-linux-gnu/perl/5.26/CORE -lperl -ldl -lm -lpthread -lcrypt  -L/usr/lib/python3.7/config -lpython3.6m  -lruby-2.5 -lpthread -lgmp -ldl -lcrypt -lm     

My actual .vimrc you can find here