The funny thing with these stones that craze is, it does not affect the ability to finish and you cannot feel the cracks with the razor or with a thumbnail.
You can see them and on a white stone the swarf collects in the crack which makes them more visible. Perhaps the swarf is filling the cracks and why they do not affect performance.
I could feel the chip in the middle and it did chip the razor.
I filled what appeared to be a few of the larger cracks even though I could not feel them. They lapped flat.
With a thin CA it would not take long to run a bead on all the cracks then lap.
I was mostly concerned with the chip in the middle of the stone. I will wait and see how it holds up. As long as it still performs, I will leave it alone. This stone sees every razor I hone.