> From: Евгений Курневский
>       <kurnevsky@gmail.com>
> Date: Tue, 23 Apr 2019 21:36:44 +0000
>
> emacs -Q
> Activate display-line-numbers-mode
> Insert some word at the first line, like "aaa"
> Execute (nth 2 (posn-at-point 2)), it will return (40 . 0)
> Execute (put-text-property 2 3 'display "A")
> Execute (nth 2 (posn-at-point 2)) again, it will return (4 . 0)

Thanks, should be fixed now.