Please Fix the the Containment Wall leakage

For quite some now I've been experiencing some troublesome behavior of the containment walls, which are not working as they are meant to do. See to the picture to understand more. I was trying to fill the ditch on the other side of the wall, but it began to leak on the botton to the other side. I knew this situation from previous bad experiences but its kind really annoying. I just hope this issue is addressed. Thank you for this great game!

its because your overfilling your walls i have a feeling your designation is touching the wall/on top of it

I agree with the OP. The game is bugged. Allowing us the option to change the size of the mine/dump squares to the smaller tile size would help with this issue.
Dirt should not go through the walls in either direction.

I ran into an interesting effect of this behavior. I wanted to have a flat surface above the wall so I designate dumping along the higher side of the wall. I designed digging along the lower side of the wall. The trucks ran around by taking the resource from digging and dumping them over the other side of the wall. Because the wall was leaking, whatever they dumped went to the other side and created an infinite loop. It took me a while to realize this and stop marking dumping right next to digging.