Problem using the file viewer and pressing "i" and having the list be re-sorted

I have a problem, when using the file viewer and pressing "i" the list of files is re-sorted
This didn't use to be this way in older versions of vim.

To Reproduce

Run open -a macvim a-folder
see the list order
press i in normal mode to see file details
see how the list is now re-sorted
cry, baby, cry
find your file again in the list (no, it isn't under the cursor, why would it)
get used to the list being re-sorted (this is hard)
accept the list is re-sorted (this is harder)
be frustrated
stop using vim altogether, because, omg.
go back to vim, cause you need it
file this bug report.

Expected behavior
when I press i in the list of files, the file details appear, the list stays in place, in the same order

Screenshots
Before:
https://imgur.com/a/FYq1UhK
After:
https://imgur.com/a/vxz8X1L

Notice how the order is different.

Environment (please complete the following information):

This doesn't happen in vim, only in macvim:

[b@localhost:]$ /Applications/MacVim.app/Contents/bin/gvim --version
VIM - Vi IMproved 8.1 (2018 May 18, compiled Jul 28 2019 01:07:30)
macOS version
Included patches: 1-1722
Compiled by travis@Traviss-Mac.local
Huge version with MacVim GUI. Features included (+) or not (-):
+acl +file_in_path +mouse_urxvt -tcl
+arabic +find_in_path +mouse_xterm +termguicolors
+autocmd +float +multi_byte +terminal
+autochdir +folding +multi_lang +terminfo
-autoservername -footer -mzscheme +termresponse
+balloon_eval +fork() +netbeans_intg +textobjects
+balloon_eval_term +fullscreen +num64 +textprop
+browse -gettext +odbeditor +timers
++builtin_terms -hangul_input +packages +title
+byte_offset +iconv +path_extra +toolbar
+channel +insert_expand +perl/dyn +transparency
+cindent +job +persistent_undo +user_commands
+clientserver +jumplist +postscript +vartabs
+clipboard +keymap +printer +vertsplit
+cmdline_compl +lambda +profile +virtualedit
+cmdline_hist +langmap +python/dyn +visual
+cmdline_info +libcall +python3/dyn +visualextra
+comments +linebreak +quickfix +viminfo
+conceal +lispindent +reltime +vreplace
+cryptv +listcmds +rightleft +wildignore
+cscope +localmap +ruby/dyn +wildmenu
+cursorbind +lua/dyn +scrollbind +windows
+cursorshape +menu +signs +writebackup
+dialog_con_gui +mksession +smartindent -X11
+diff +modify_fname -sound -xfontset
+digraphs +mouse +spell +xim
+dnd +mouseshape +startuptime -xpm
-ebcdic +mouse_dec +statusline -xsmp
+emacs_tags -mouse_gpm -sun_workshop -xterm_clipboard
+eval -mouse_jsbterm +syntax -xterm_save
+ex_extra +mouse_netterm +tag_binary
+extra_search +mouse_sgr -tag_old_static
-farsi -mouse_sysmouse -tag_any_white
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: "/Applications/MacVim.app/Contents/Resources/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MACVIM -Wall -Wno-unknown-pragmas -pipe -DMACOS_X -DMACOS_X_DARWIN -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib -L/usr/local/lib -o Vim -framework Cocoa -framework Carbon -lm -lncurses -liconv -framework AppKit -fstack-protector -L/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE

OS: macOS 10.14.2
Terminal: GUI

Additional context
Why vim why...

まず、macOS 上の MacVim GUI でファイルビューアーの動作を再現します。フォルダーを開き、ファイルの順序を記録して、ノーマルモードで i を押します。前後の順序とカーソル位置を比較します。ファイルの詳細が表示され、リストの順序が変わらず、選択したファイルも移動しなければ完了です。