Fresh install with just Moonlight Lib and Snowy Spirit, the advancement for going fast with a sled seems to be bugged.

Forge 1.20.1, Snowy Spirit 3.0.6, though I remember this happening on Fabric as well.

Changelog says this was fixed in 3.0.8, but I noticed the title & description are swapped:

"advancements.adventure.sled_with_wolf.description": "The Wolf of Haul Street", "advancements.adventure.sled_with_wolf.title": "Let a wolf pull a sled with chest",