Is the fork cracked and rendered useless or is this nothing to be concerned?

I had gotten a frame set off Otso last December that included a Lithic Hiili fork, I just started building it recently. I cut the fork with a 32 tpi hacksaw and it cut cleanly. After I installed the fork and stem and tighten the pinch bolts to 6 nm , I found that I needed to cut a few millimeter lower so I removed the fork and upon inspection I find this long line that curves slightly going from the top to bottom of the steerer tube. I find that the piece that was cut off earlier had the identical matching line when I stacked it back on top. The thing is hat I don't even feel anything on it, it is smooth to the touch and inside the tube there is nothing abnormally visible. I hadn't even completed my bike build and now it's cracked? I thought carbon fiber wasn't that fragile if taken care of.
Last edited by RMoudatir; 08-16-19 at 12:33 AM.