This is a new problem seen in the 21.1 release. Rolling back to the 20.1 release fixes the issue.
To reproduce the problem:
Export a scheduled method for Agilent 6400 Series.
Open the XML and observe that the scansegment includes this <isTriggeredMRM>true</isTriggeredMRM>.
For a scheduled method, this should be false.
There are no primary or triggered transitions in the method, so the method is an invalid method.
The root cause
The transition columns sent to the method creator includes the "IsTriggerMRM" column.
This causes the method creator interpret the data as a request to create a triggered method.
Please do not include the IsTriggerMRM column when exporting columns for scheduled methods.