SubQuery Not Working

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My debugging leads me to think that the issue is actually with the CI4 System framework itself. It appears not to be building the subquery at all, before it hands the result back from the anonymous function call [function(BaseBuilder $builder)].

I have given up on subqueries an just using the SQL code below

$sql = "SELECT DISTINCT subject_code,subject_name
FROM central.v1_cal_subjects
WHERE cal_id IN (SELECT cal_id FROM central.v1_calendar WHERE `year` >= YEAR(NOW()))
ORDER BY subject_code";