No preview links for documentation from developer.apple.com

I'm not sure if this is an issue with this site, or with Apple's developer site, but if I have a link from somewhere random on the internet, the forums can generate a little preview box thingy:

https://www.reddit.com/r/swift/

But it can't for documentation from Apple's developer site, which is a shame:

https://developer.apple.com/documentation/foundation/calendar/2293473-nextdate

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