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Here’s a fix for the ‘Load More comments’ button loading the same comments over and over again when a persistent cache layer like Redis or Memcached is used. Description of cause of the problem and approach used to fix it is in the comments.
https://gist.github.com/mklepaczewski/51817ee3d43f792a475f68fee154d723
While this is not a patch but a plugin for end users it should be trivial to use it and patch wpDiscuz code.
If possible please include the fix in the next release.