When I switch to the board in a fight with the cave fish, it shows the animation for the mace, and seems to behave as the mace. Anyone else seeing this?

I'm glad to see that someone else had the same problem I did with it showing up as the mace - though when taking a swing at the biker you're apparently supposed to hit with the board, it did the trick.

Yep, I'm getting it too. The plank icon selected but the mace appearing. It seems to be acting as the mace too as I can't defeat the last biker to progress out of mine road. Weirdly, the plank is equipable with literally every other biker other than the one you need it for.