Just having an initial look-around on this and my guess is it's something to do with the argument parsing, as implemented by the spf13-cobra and/or spf13-pflag libraries.
I found this PR recently merged into k8s master in commit 8e81025 on May 22: https://github.com/kubernetes/kubernetes/pull/25512 I haven't had time to look into it deeply but will do so later today. It might be interesting to take only the tests out of the patch and check that they fail without the source patch. Another idea check or wait for v1.3.0 to come out and rebuild/retest with that. Tim.
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