WP ajax issue

I have several pages where posts are loaded via ajax via load more or on scroll. When LS is on the ajax items do not load. There is no error but the response is empty. If I set those pages to No optimization and reload it caches them and ajax works again.
If I empty the cache completely and re-cache it works also.

Does anyone know a specific setting that might cause this?

Optimizations settings
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Nothing , it simply does not load. No JS bugs , no elements hidden via CSS . The response is simply empty and it should contain additional items so that they could be added to the stack.