We have a question on the cql definition for CMS128v12.  The written description states that patients should be excluded "who were actively on an antidepressant medication in the 105 days prior to the IPSD".

The cql for the exclusion states:
exists ( ["Medication, Active": "Antidepressant Medication"] ActiveAntidepressant
let ActiveMedPeriod: ActiveAntidepressant Meds
return Meds.relevantPeriod
intersect Interval[start of "Intake Period",
end of "Measurement Period"]
where "IPSD" is not null
and Global."ToDateInterval" ( ActiveMedPeriod ) overlaps Interval["IPSD" - 105 days, "IPSD" )
Our question is with the intersect as it appears that if an ActiveAntidepressant Meds relevantPeriod ends prior to the start of the "Intake Period" the intersect will return null and the result of the overlap with Interval["IPSD" - 105 days, 'IPSD"] will also be null and the patient would not be excluded.  Yet the ActiveAntidepressant Med could have been active during the 105 days prior to the IPSD.  For example: 

Patient has Active Medication from Antidepressant Medication Value set with relevantPeriod
    <low value='20220401100000'/><high value='20220430100000'/>

which when intersected with the Interval[start of "Intake Period", end of "Measurement Period"] (Interval['20220501000000', '20231231235959']) will return null as they do not intersect.

This null result will return null when asking if it overlaps IPSD for instance if "Earliest Antidepressant Dispensed During Intake Period" returns
Dispensed Medication from Antidepressant Medication Value set with relevantPeriod
    <low value='20220501100000'/><high value='20220530100000'/> the IPSD is 20220501.  

This patient has an active antidepressant during the 105 days prior to the IPSD but asking for the intersect with the Interval[start of the "Intake Period", end of "Measurement Period"] appears to remove the medication from consideration.  

Are we interpreting the cql correctly?