Always buy more tubes than you think you need. They're a cheap, disposable part with lots of defects, so it shouldn't surprise you when you get a lemon. Return this one for a refund.
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If you stuffed the tube into the tire and inflated it, it might have had a small fold in it that got trapped and split.
When you inflate the tube the first time, you should inflate it slowly and only a little bit, massage the tire to release any kinks or folds, then slowly increase pressure until about half way. Then give it another massage and deflate it. Then you can slowly refill it all the way.
Looks like manufacture defect.
What brand?
Schwalbe! That's why I'm surprised, I've never had issues with them.
That is surprising, Schwalbe stuff is usually pretty solid.
Switched to their tyres on one of my previous bikes a couple years ago, and was pretty impressed with the smooth quiet rolling, and puncture resistance. Currently running road cruiser greens with their inner tubes