Thankfully, this was patched in the last update since this bug.
Today is a sad day for us Dievdirbies, after the maintenance patch that happened this afternoon on 21 June 2016, our Carve World Tree skill is officially useless.
Previously, when Carve World Tree is cast, all mobs affected by its radius become stationary and do nothing. Now, all mobs affected by its radius can continue to attack you and cast spells as if nothing had happened. As you can see, this ‘spell’ is quite a game changer in parties.