Unaired drama without rating shows a rating of 10 in watchlist under "plan to watch"

This unaired drama doesn't have a rating, but when it's added to your Watchlist under "plan to watch", it shows a rating of 10 in the Score column:

https://mydramalist.com/65743-alien-girl-chai-xiao-qi-2

Screenshot here:

https://imgur.com/a/CD3GYsN

(I'm not sure why, but it wouldn't let me insert the image directly into this post. It kept saying "something went wrong. please try again.")