Something similar happened to me a long time ago, the safe height was reset to a very small number like .02mm and scored my workpiece. Since I had never changed this field, I was puzzled as to how it got changed.
Many people have pointed out this happens on strange and rare occasions over the last few years… it is a bug. However since no-one can reliably recreate it Carbide3D have not been able to fix it…
Well - IF you can do that again repeatably then you need to send it into support@carbide3d.com on behalf of all of us - and then perhaps it might get fixed !