Also, here is the original source of the article reposted on Yahoo:
Scraping the original article works perfectly with full-text-rss. This is the expected output. No invalid html, no weird tags attributes, no messy css stuffed inside “content” attributes, and everything works perfectly with all readers or posting to wordpress.
http://ftr.fivefilters.org/makefulltextfeed.php?url=https%3A%2F%2Fwww.newswire.ca%2Fnews-releases%2Fvivo-cannabis-to-host-third-quarter-2019-financial-results-conference-call-847770931.html&max=3
No error at all related to the content with W3C validator when scraping the original source instead of Yahoo:
https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fftr.fivefilters.org%2Fmakefulltextfeed.php%3Furl%3Dhttps%3A%2F%2Fwww.newswire.ca%2Fnews-releases%2Fvivo-cannabis-to-host-third-quarter-2019-financial-results-conference-call-847770931.html%26max%3D3