Challenge races count natural blocks only, and nickname styling follows your rank

• Blocks you place yourself, including Silk Touched ores and Ancient Debris, no longer count toward /races challenges, even after a server restart. Only naturally generated blocks count.
• When a rank that gave your nickname colours or formatting ends, your nickname keeps its text but drops that styling on every server and shows your current rank colour instead.

This covers everywhere your name appears across the network, including messages and history from other servers and server player lists.