I had a rear tyre blow in a similar fashion and it was believed due to the tyre fitting machine having caused damage to the inner edge of the rim. This imperfection gradually wore through the tube. The damage was above the area covered by the rim tape.
It happened almost 2,000 miles after having the tyres changed.
I used a file to smooth the rim again, apparently seemed to fix it.
Check your wheel rims are smooth on the inside!
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