When I was trying to lit a campfire, I right tick the side of a campfire ,but the campfire didn't litted. In fact, the fire had be litted on the ground. I'm not sneaking when I was trying to lit it.

And if it's avaliable to lit other block ,it will try to lit other block instead of  trying to lit the campfire .

Maybe when trying to right tick a campfire with flint and steel, it will try to set the fire block first. If it's not avaliable to set the fire block ,it will try to lit the campfire. I think it is not thhe right order.