Frosted Tiles Dosent Create Diamond

As title says, some times frosted tiles dosent create diamond or a dragon. I encountered this few times and there isnt anything written about this in season event so i think its a bug maybe im wrong idk. But dosent happen all the time like

3 posts were merged into an existing topic: :santa: Santa’s Challenge (Christmas) 2020 - Teams, Strategy, FAQs, Discussion, and Links – Starts December 01