Not sure if it has been fixed yet because I reported this to Jorb about 3 months ago (at the start of the world) and never got any reply back.
When you dig clay with an alt that has survival 1, the clay node hardly drops in quality. I had to dig about 3000 clay q10 unil I noticed it drop by 1q with my main character.
This is a pretty bad exploit used for brickwall building.
Again, I'm not sure if it has been fixed yet, maybe someone can confirm it still exists/got fixed?