Yeah, that was an issue. I cannot tell how much of an issue, because I have zero experience with medical trials. As do most people, I assume, getting upset about that. Regardless, AZ got approval in the UK and from EMA in the EU. And these entities job is clinical trial assessment.
Unless I am going to refuse any and all drugs and medical treatment, I will have to trust e.g. EMA that the stuff I take when being sick is safe and working as intended.