We were told that they are fixed in the version we're running, but they don't seem to be. We'll have to wait for the full release of 0.18.1 to see if it's finally fixed
It looks like at least some version of 0.18.1 is out, and looking at the changelog, the PR that fixed it is indeed there. I can't find the 0.18.1 changelog for the one we're running, but maybe the PR only made it into a later release? https://github.com/LemmyNet/lemmy/releases/tag/0.18.1
(hot rank update batching being the entry in question)