Record removals are not synchronized

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I'm using Cognito Events to trigger a Lambda function which validates and removes invalid records in the dataset (as described here).

When the Lambda function removes a record from the data store, the sychronize() response from the Cognito server looks correct - the record isn't returned... But the record is never removed from the local dataset.

How am I supposed to synchronize record removals?

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Nervermind, I think this was user error.

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Reopening this issue. I don't think this was user error after all.

When my Lambda function removes a record from the server dataset, the record remains in the local client-side dataset, but it's value is set to an empty string.

I would expect the record to be completely removed when I perform a sync.