I doubt it has anything to do with the glass transition temperature of the rubber (i.e. exposure to cold temperatures). This is a tread splice failure issue, and the Tglass exposure issue would show up in many places on the rubber (i.e. see the pictures Toyo shows of an R888 exposed to cold temperatures in their warning document).
In my case, my tires were built in week 32 last year if I recall correctly (late July sometime), and I purchased them in late October.
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Current Stable:
2024 G20 M340i Melbourne Red/Cognac
2019 F87 M2 Competition 6MT, LBB, slicktop, exec pkg
2007 E91 328i Silver, slushbox, Eibach fr/E93 M3 rear sway bars, ARC-8
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