After the last Update, the Pickaxe does not damage the minable nodes. normal damage is shown (like 236 when hit a copper-node). now nothing is shown.
tried with the axe to cut down trees - this works.
tried server-reboot, tried client-reboot.
Update:
Mining Clay with Pickaxe works.
Seems to affect only Copper (did not progressed to next biome, cant try iron or sulfur for example)