Why are oneboxes cached into posts?

[Cardinalflyer (Keith Peterson)]

@pfaffman

There’s no way to know that it’s changed, so forcing a post-rebuild (with the wrench or by editing) is the way to go.

I’m building Onebox support into my site and editing a post is not refreshing the onebox cache. I also don’t see an option to “post-rebuild” under my wrench menu.

However, adding a fake querystring does work, although if I go back to the initial URL the cached version comes back up.

Is there a setting or trick I’m missing?

My version is: Discourse 2.5.5