The app OG image isn't updating

The OpenGraph image representation of my app in the Flathub store should update and match the new branding colors I updated in the metainfo manifest.

This meta tag can be found in Install MQTTy on Linux | Flathub html source code

<meta property="og:image" content="https://flathub.org/api/appOgImage/io.github.otaxhu.MQTTy?locale=en" data-next-head=""/>

When I visit it, I get the old branding colors, but when I remove the query param locale=en, I get the current one.

Is this a bug or it should update soon?

It’s gray for me on both? Which seems to be correct.