Tasks not showing completed date

I don’t know if this is something I need to configure, but on the Silverbullet demo page when a task is completed it shows a checkmark emoji and the date it was completed at the end of the line like:

However, in my own instance this has never been the case. It just strikes through the text. I’m running 0.10.4

check this out https://silverbullet.md/Space%20Script@6003

I just found it yesterday. It is actually using space-script with task:change hooks, the full script on the website

Ahh well that explains it. Thanks for your help!