viktorix opened a new issue #1630: InsertNodeBeforeNode: existing_node invalid URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1630 We have lazy loading enabled, and I noticed that images sometimes don't load at all. All images on pages. If I refresh once or twice, they show up. If I refresh again once or twice, they disappear. Scrolling doesn't help. It does appear that lazy loading doesn't work correctly for some reason. I can see lazy loading attributes on hidden images. Our beacons are turned on. No console errors at all when images are hidden. Access logs show ngx_pagespeed_beacon requests are all 204. The only relevant error I found in the nginx error log is this: ` [alert] 1409#0: [ngx_pagespeed 1.13.35.2-0] InsertNodeBeforeNode: existing_node invalid` This is a WordPress site. It's a LEMP stack, nothing fancy. CDN is also used with proper pagespeed mapping. We also use page caching, to serve HTML files. What could cause issues with lazy loading? Here's a screenshot of the hidden image:  Tested in Chrome and Firefox.
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