Cache key - uuid mapping is not kept in sync anymore. Actually it's not created at all. The UUID-cache-key cache is always empty. Due to this problem it's not possible to flush pages w/ comments from the cache in timely manner.

The issue is caused by call to MgnlContext.getAggregationState().getCurrentContent() in {{ info.magnolia.module.cache.executor.Store.processCacheRequest(HttpServletRequest, HttpServletResponse, FilterChain, Cache, CachePolicyResult)}} which seems to always return null now, while previously it returned the page content.

Quick solution is to change this call to invoke getMainContent() instead, the ultimate fix for the problem is to remove usage of deprecated API all together.