I think it is highly unlikely with a tube, but it is possible. (Happened to me as a kid; bike was stored under the porch for a few weeks in the heat...
From what I've read on the Internets, I think by construct tubeless tires are more susceptible to something like this happening "early" in the tires...
Could be a defect or, given the life of the worn tire, it could be some of the threads (around which the rubber is moulded) on the inside giving way...
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