When i open my minecraft and i enter the world, the first thing i notice is that there is no wrench anymore, so i am forced to break the block and place it until i get it the right way..
The wrench is there, but since it lost it's texture, I assume it has also lost it's function.
In case you want to try it by yourself, go into Creative, select Tools and scroll down until you see an untextured item named 'item:basiccomponents:wrench.name'
YAY! Mic re-added wrench. Wrench time!