purge from cache not working

Hello,

I am experiencing some issues with the page-cache. after updating posts or pages they are not purged from the cache. Even after clicking the ‘purge from cache’ link on a post edit page does not purge that page from the cache.

I have following options checked in the purge-policy settings:
Front page, Posts page, Post page, Blog feed

but the setting doesn’t seem to effect anything. Only clearing the entire page-cache, using the ’empty-cache’ button on the settings page, seems to do the trick.

I have also tried to use a function to purge the pages via w3tc_pgcache_flush_post(), but it didn’t help either:

function purge_cache_on_save($post_id) {
  if (function_exists('w3tc_pgcache_flush_post')){
   w3tc_pgcache_flush_post($post_id);
  }
}
add_action( 'save_post', 'purge_cache_on_save' );

Currently the site is on a Apache server.

Are there any settings I have missed that could resolve this problem or do you have any other suggestions what could cause this behaviour?

Thank you in advance.

https://www.ads-software.com/plugins/w3-total-cache/