Let’s understand them in detail.
Poor User Experience
Incorrect Implementation Of Lazy loading Or Infinite Scrolling
Martin says that Lazy loading and Infinite scrolling are two great techniques to display listings on a page only if implemented correctly. Improper implementation of these techniques can lead to Googlebot being not able to crawl the page content properly, which is not desirable. He also added that they are working on better guidelines for the implementation of infinite scrolling.