I thought this problem will disappear upon switching to Kagi, but it suffers from the same disease, albeit to a lesser extent.

I remember reading a Google Search engineer on here explain that the engine just latches on some unrendered text in the HTML code. For example: hidden navbars, prefetch, sitemaps.

I was kinda shocked that Google themselves, having infinite resources, couldn't get the engine to realize which sections gets rendered... so that might have been a good excuse.