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As the code comment says, there are issues with the concurrency test for etcd in CI, but they are not reproducible locally, and also don't always happen in CI.
Previous fix attempts haven't worked:
We skip the test in CI as a temporary workaround, and before a release we can and should run all tests locally to include this one.
I also searched a bit on the web, the etcd GitHub Discussions and their Google Group.
In the future we could post a question in one of their communities.