Has Anyone Successfully implemented SpecialAnnouncement Schema?

[LocalSEOLady]

Hello,

I'm in the process of updating my clients' websites with the SpecialAnnouncement Schema type, and I'm wondering if anyone has successfully done so yet, and whether or not they're seeing any kind of results /richsnippets directly in SERPs from it?

Also, has anyone else run into issues checking their schema with Google's Structured Data Testing Tool? Sometimes I get an error saying "specialAnnouncement is not a type known to Google," and sometimes I get one saying that "the property datePosted is not recognized by Google for an object of type SpecialAnnouncement." I assume these errors are because the schema type is so new, but you know what happens when you assume...

Thank you for any insights!