back/forward doesn't refresh the displayed example

whether i go back/forward with mouse buttons or the browser navigation, example isn't refreshed:
https://github.com/tsoding/zozlib.js/assets/31964869/8248e87b-bdd6-460d-9330-3d5acedf9fbf

not sure whether the issue is browser-specific, but i'm using Firefox Developer 119.0b9.

