Obsidian Pickaxe Not Harvesting

Game mode: Private Main Branch
Problem: Maybe A Bug
Region: EU

Not sure if I needed to be a certain level for this to work. At Lv 51, I was given an Obsidian Pickaxe by another player. I took it out to use it and found that I couldn’t harvest rocks or iron with it. It would hit, but zero resources were gathered.

Did I need to have been a higher Lv to use it or is this a bug?