+1

I had a couple of blowouts that happened while the bike was parked. Warm days, in the sun. Searching for the cause and it seemed that the hole in the tire corresponded with a spoke hole in the rim where the rim tape had punctured. Replacing the tape with something more substantial fixed the issue.

However, a rim tape puncture wouldn't damage the tire. I would guess that the hole in the tire caused the tube blowout. And, depending on how often you inflate your tires, it might even be a hole that had been there a while or even just a weak spot. I would expect that any item that actually punctured your tube would either cause an immediate blowout or a slow leak. The fact that the bike was parked and had recently been inflated makes it seem like the tube ruptured as the pressure increased.