Ah, the infamous Specialized delamination. Happens to the best of 'em!
I had six or seven old Specialized Nimbus tires from various time periods delaminate on me. Seems that's always how they fail, but after a generous service life. Sometimes I'd even find broken glass inside between the detached tread and the protective belt. Amazingly, no flats!
__________________
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.