Report Label Conditional Print Expression Not working?

I have a label in a report that I only want to show when a logical field (Turbocharged) is true.
The logical field is defined in a table record and the same field is also defined in the query that generates the report.
I have defined the Conditional Print Expression for the label field as [Turbocharged] (though I have also tried numerous variations including IF) and the label doesn’t appear whether Turbocharged is true or false. What am I doing wrong?

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