Automated Collections: Metafield Definition Not Indexing Previously Set Values

[_buerohuegel]

We're using an app that writes Boolean (True/False) metafields to our products. I'd like to set up automated collections based on those metafields. I've set up a metafield definition accordingly and now can filter my collections based on that. So far, so good.

However, products whose metafields were set before the metafield definition existed aren't getting indexed in those collections.

Is this common behavior, and is there a workaround?