Much of the mask research was entirely absurd, as has been discussed.

Aug 13, 2021 (CDC.gov) Misleading Claim: Reduced Risk of Reinfection with SARS-CoV-2 after COVID-19 Vaccination in Kentucky (May-June 2021)

• Reality: Both arms had natural immunity, not just one.
• The time period was extremely short.
• The risk in both groups was tiny and the absolute risk reduction tinier. More days of life was probably wasted in the process of writing and reading this paper than would be saved by vaccination, and that doesn’t even account for the cost.