The hole in the tube was opposite the valve on the inner surface, toward the rim, not the road. The rim strip had slipped aside because of the stupid shape of the rim floor.
Note how it has the pointless and always destructive channel within a channel design that serves no structural purpose and always leads to tube problems. In this case, the machining for the spoke holes creates a sharp edge that slices the tube when the rim strip inevitably slides to one side because the secondary channel does not provide a stable surface to hold it where you want it.
Way to innovate. "Innovate or Die," their tough guy slogan says. So what's their excuse for crap like this? Closer examination shows the rim was made for Specialized by Alex. So, way to subcontract, guys.
Now I have to figure out how to shim that space. The filler we use on the much worse Alex RP 15 rims is a little too chunky for this space. The RP 15 rims cause internal blowouts because their channel is so deep. These Specialized Alex disc brake rims present a slightly different problem with their built in tube slicers.