The person got the vaccine, was then admitted to hospital 18 days later for mild gastritis, caught COVID from another patent on the ward & dies a further 8 days later (26days after vaccine).
"Taken together, it appears the patient became infected from the patient in his hospital room. - We concluded that the patient died from bronchopneumonia and acute renal failure. - In summary, the results of our autopsy case study in a patient with mRNA vaccine confirm the view that by first dose of vaccination against SARS-CoV-2 immunogenicity can already be induced, while sterile immunity is not adequately developed."
Basically what anybody with any half decent brain would say, the body has started to make its immunity against the virus due to the vaccine, but not enough time had passed for more effective protection to be developed by the body & only on a single jab.
So again all as per one would expect considering the patients condition & time frame after the first jab.