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I don't have cracks on mine, but I'd guess there is a weak point created as the plastic flows round the speaker feature in the mold, if the material meets at a different temp, pressure etc it will create a weak point as it won't flow together correctly. Think of something like a marble cake, you can quite easily pull the two colours apart after it cooked, as it's not fully mixed. Technically called a weld, flow line or mold line.
They are probably still tweaking the process. There are so many variables it could be just covers from : one tool, one cavity in a tool, all are affected to some degree, or some batches . . . . . . The worse ones may get more visible with use or heat.
it would be interesting to look at the production date from the serial number of all the ones with an issue.
I have had one from launch day and an other the last week or so an neither have the issue. . . use TS on both.
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