gosr

img2sixel

Reproducing
git clone https://github.com/vizs/stixel && cd stixel
git checkout 1d19252
make
./st
gosr astolfo.png
This does not happen with a patched xterm.
Original image: https://media.discordapp.net/attachments/361916911682060289/569426543777153044/astolfo.png