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@allensea
Had another belt fail in the same way, after roughly the same milage. Inspected it closer this time. All the wear appears to be even across the width, so dont think it is an alignment issue. No slipping, so not tension either. When I bent the belt back on itself I could see that every tooth that remained was about halfway delaminate - pulled away by the forwards pedalling motion.
I got sent two replacements last time so there is one left to go. I have a feeling the failure is a combination of me being too heavy (90kg) and the rear pulley (21t) not spreading the load across enough teeth.