You're speculating again. How do you know that it includes the whole of the contract?
If one side interprets it as, "only up to production of a working vaccine", that is a perfectly reasonble interpretation, especially if that is specified in the contract.
from the contract, the way it is written it also cover manufacture as a best effort:
“Best Reasonable Efforts” means
(a) in the case of AstraZeneca, the activities and degree of effort that a company
of similar size with a similarly-sized infrastructure and similar resources as
AstraZeneca would undertake or use in the
development and manufacture of a
Vaccine at the relevant stage of development or commercialization having regard
to the urgent need for a Vaccine to end a global pandemic which is resulting in
serious public health issues, restrictions on personal freedoms and economic
impact, across the world but taking into account efficacy and safety; and
(b) in the case of the Commission and the Participating Member States, the
activities and degree of effort that governments would undertake or use in
supporting their contractor in the development of the Vaccine having regard to the
urgent need for a Vaccine to end a global pandemic which is resulting in serious
public health issues, restrictions on personal freedoms and economic impact, across
the world.