Google Web Stories question?

I am having some crazy success with Google Web Stories lately - bringing over 1k website visits in a single day from a couple of posts!

The reach is relatively short-lived, but if you feed the beast in the same way you would handle Pinterest, it seems to have legs.

The only thing I'm a little confused about is the indexation of the stories themselves. They seem to be far more sporadic than regular blog posts (for my main site at least). For example, I have 2 stories that have yet to be indexed for nearly a week! The longest it takes any of my regular blog posts is a couple of days, max. Does anyone have any experience/insight into this?