I tried to do a front/back on some proofgrade maple ply. I took the utmost care to make sure nothing was moved between jobs. There was a horizontal shift front and back without the material or job being moved.
Well, I was trying to cut a puzzle on chipboard. To minimize charring, I chose to lower power and make it multiple passes. It isn’t proofgrade, but I made sure it was perfectly flat, anchored in place, and measured to the nearest thousandths of an inch. A job told to run 2 passes of the same cuts cut the second pass offset from the first.