Odd the cut didn’t penetrate, did you have it held down on the bed? A little warp can make the difference. I always check for flat by tapping the center and pushing on the corners.
If I am in doubt, while holding down the material I will use a pick or a piece of tape to see if the piece is cut free, if it isn’t, as long as the material hasn’t moved you can run another pass to finish the cut.
Although having previously cut from the same piece, I probably wouldn’t have thought to check.
This was a hard habit to break, but I’ve finally taught myself to (1) tape or magnet everything to the bed, and (2) check for incomplete cuts by lifting all objects with a scrap of blue tape before (re)moving the material. This has saved me on many occasions.
If it’s a wood product that almost cut through, you can give the back of it a good sanding to complete the cut without splintering. This of course, depends on the project and if you have a little thickness to spare.
Same here, it has saved me a TON of time, material and effort. There have been more than a few times that I completed a cut only to find out that I need one more pass to get it all the way through (This is on my own material, non-)