Doesn't work with emulate sh

[romkatv]

This is on master.

docker run -e LANG=C.UTF-8 -e TERM -it --rm ubuntu bash -uexc '
  cd
  apt update && apt install -y zsh git
  git clone https://github.com/powerlevel9k/powerlevel9k.git
  echo "emulate sh; source ~/powerlevel9k/powerlevel9k.zsh-theme" >~/.zshrc
  exec zsh'

Actual:

Expected: