I just updated to the newest patch and now I'm having issues with undiggable blocks(copper and dirt). I didn't have that issue before this update. Digging worked fine when I first updated to the Thermal Upgrade.
The block disappears, but the dupe keeps digging an invisible block and can stand on the invisible block.
I will post a short clip of my experience with the issue if that would help.
Digging in copper and dirt. Not sure how to replicate.