./vim --clean --cmd 'set lz title' --cmd 'autocmd VimEnter * sleep'
Summary:
========
If it works for you, you may see that the title string is not
redrawn when Vim is fully loaded up.
That is, when the VimEnter autocommands take too long with 'lz' set, the
title string is not updated. Obviously, this is not a command anyone
would run. However, my config has several VimEnter autocommands from
plugins, and the title string is never loaded up for me when I start vim.
Let me know if you can repro!
FWIW, I am currently at Vim version 8.1.885 and I can reproduce it.
Tom