This is what could happen when a forklift turns in a reduced or narrow space. Always have somebody watching your back (and on foot) when operating one. Anyways, slabs should be always handled by at least 2 persons if using and overhead crane or 3 if moved with a forklift.
And indicate where walls are in your Shop Tickets. Majority of fabricators, most times are job-site-blind and can only see the light through drawings.
You thought that only Marble requires special handling? Perhaps believed that cracks or faults are exclusive of Granite? That Travertine and Onyx are the only stones that can snap open? Add engineered stone to that list.