Custom content space permission app drop-down broken?

If a Confluence Connect app has custom content with configurable space permissions, the user can configure them under Space Settings > Permissions > Add-on. There is a select element on that page labeled “Add-ons”.

Is it intended that it only has one item “Atlassian Connect Plugin” and not a list of apps? I’m not sure if my memory serves me, but I think I remember that it contained a list of apps once. Now it seems that all custom content types are combined in a single entry.

Has this been changed? Is this as intended? Or is this a bug? If this is as intended, what other elements can this select element possibly have?

Note about the screenshot: the content type “My Content” is from a different app than the other two.

app-permissions-picker