Overall pic

Call Kohler. They are happy to fulfill their warranty.

Thank you I’ll call Kohler. I applied caulk later after install and it wasn’t there. I may have dropped a sample tile by it, but it cracks that easily?

Top mount sinks of any variety are vulnerable to impact damage at corners. Abuse isn’t covered by warranty from anyone.

Pull the sink, profile and polish the cutout, and strap the sink as an undermount. Four hours, tops.

I don’t have enough space underneath to mount under. I have no idea how this happened. I thought it had something to do with the seam and stress.

I would start with Kohler. I wouldn't start with volunteering information unless asked for it.

"I don’t have enough space underneath to mount under."

You absolutely do.

From the photo, I suspect there was mechanical damage to the underside of the sink near the missing chips in the porcelain. I think the cracks initiated in that area.

Could have it anything to do with the counter seam?

I agree with what Charles Ross said...mechanical damage.

No, I don't think it has anything to do with the seam. The seam & the cracking 99.999999....% pure coincidence.

^ Agree. Were I Kohler's warranty agent, I'd rule mechanical abuse.