We have recently improved the lazy loading of images on our site, but are now experiencing some anomalies in Fetch and Render.
The issue is that although the view that Googlebot sees is correct and renders exactly as the user seesit, the view that claims to be as the user sees it is not. It's all correct until you get towards the bottom of the view, where some of the images are not shown, this is intermittent.
It is the same images that fail to render, if the do fail at all, but only one or two out of many. These images have nothing untoward about them and are all small and optimised.
There are cases when the entire page is not rendered, but again this is intermittent. My thoughts were that as the page loads, there are no events to tell Google that everything that the page requires has finished, so there is a delay between resources at which point they deem it complete. If this were the case however, I would expect the whole page to show, but possibly unstyled. Again, this is not the case.
Is this something that is common or seen at all, and is it something that we should be concerned about, seeing as the Googlebot view is correctly shown?