[3.5] Fix ts with no trailing zeros

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #18108

/assign jmhbnz

[k8s-ci-robot]

Hi @k8s-infra-cherrypick-robot. Thanks for your PR.

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[jmhbnz]

/ok-to-test

[jmhbnz]

Proposing this backport for release-3.5 for inclusion in our upcoming v3.5.15.

cc @ahrtr, @serathius, @ivanvc

[ivanvc]

/lgtm

Thanks, @jmhbnz

[k8s-ci-robot]

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