> Emacs  : GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
>  of 2019-08-29

I'm using Emacs 27 pretest.  Maybe you can try it as well and see if the
issue persists.  You can fetch it from here:

    https://alpha.gnu.org/gnu/emacs/pretest/windows/emacs-27/

Best, Arash