That's interesting. I previously researched this with regard to React apps, and the tenor was that server-side rendering was no longer required in order to get

That's interesting. I previously researched this with regard to React apps, and the tenor was that server-side rendering was no longer required in order to get indexed by Google. Google itself has this to say: https://webmasters.googleblog.com/2014/05/understanding-web-pages-better.html https://webmasters.googleblog.com/2014/05/understanding-web-... Have you tried to figure out the cause using Search Console?