lex-web-ui not loading in some Chrome Incognito browsers

We have encountered numerous users not able access the lex-web-ui iFrame component deployed on our site, when they visit the site from an incognito tab on Chrome. This behavior is most prevalent on mobile, however we do occasionally see it on web as well.

This behavior has been encountered by users on different networks, as well as the same network with varying results. There are no CORS errors console errors when this occurs.

Start by reproducing the lex-web-ui iframe failure in Chrome Incognito, especially on mobile, across the different networks described. Inspect the browser behavior despite the absence of CORS console errors; done means the iframe loads reliably in the affected Incognito environments.

Written by the indexing model from the issue text.