Backport of Ensure that the index processed by the client is at least as new as the last one processed. into release/1.6.x #18341
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Backport
This PR is auto-generated from #18269 to be assessed for backporting due to the inclusion of the label backport/1.6.x.
The below text is copied from the body of the original PR.
A fix for #18267, ensuring that "time travel" of the client state is not possible.
I could not find tests which may exercise this logic meaningfully. Please point me the right direction and I'm happy to add them
Please note that this isn't an actual good fix to the underlying issue, but rather a stop-gap measure.
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