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Click the link below and scroll down to the Frequently Asked Questions. Click the "Where's the scientific evidence" tab. Then click the link to the study. When you do that, you'll see a blue box telling you the study has a correction. Click the Do Face Masks Help? link. That is where you find the corrected paper that debunks the original study claiming masks stop COVID transmission. All the links are below as well but it all starts at the Pima link.
https://webcms.pima.gov/cms/One.aspx?pageId=563362
https://www.pnas.org/content/117/26/14857