The "Serious Dedication" challenge is marked as complete by obtaining a netherite hoe in any way (e.g. from bartering or from a chest).

Intended behaviour seems to be that the challenge should be completed only when upgrading a diamond hoe.

How to replicate:

• easy: get a netherite hoe from the creative inventory
• less easy: barter with piglin until it gives back a netherite hoe

The first time I encountered the issue, I got the hoe from bartering and the challenge was completed (in a previous snapshot). Upgrading the world apparently reset the challenge and I completed it again just by getting the hoe from my ender chest.