By design, of course.

The last 7 Public Health England / UK Health Security Agency ‘Vaccine Surveillance’ report figures on Covid-19 cases show that double vaccinated 40-79 year-olds have now lost lost 50% of their immune system capability and are consistently losing a further 5% every week (between 3.9% and 8.8%).
Projections therefore suggest that 40-79 year-olds will have zero Covid / Viral defence at best, or a form of vaccine mediated acquired immunodeficiency syndrome at worst, by Christmas and all double vaccinated people over 30 will have completely lost that part of their immune system which deals with Covid-19 within the next 13 weeks.