Laser-Engraved CD Stress Cracking

Given the cracking caused by vector patterns on CDs and DVDs, seeing stress cracks open up on large-area engravings came as no surprise:

They start smaller in the more closely engraved areas:

But eventually spread over the entire surface:

They’re not always straight:

And aren’t aligned with the engraving path:

My threat model says those discs are definitely unreadable …