A fellow inmate has provided new details surrounding the brutal 2023 prison assault on former Lostprophets singer Ian Watkins, claiming the musician was actually stabbed over a drug debt. Watkins was initially jailed on a 35-year sentence in 2013 over multiple child sex crimes and this is not the first time he’s run into trouble behind bars. In 2019, he was charged for possessing a mobile phone while in prison, but told a jury he was instructed to hold the phone by known murderers and “didn’t want to mess with them.” As for the 2023 attack, it was reported last year that he had been taken host…