Can't reference the Last Interesting Moment Desc field in Smart List Trigger/Filter
I want to create a "First Interesting Moment Desc" field and was planning to block it from updates and to populate it as follows:
Smart List - Trigger:
Data Value Changes->Last Interesting Moment Desc
Previous Value: NULL
Flow:
Change Data Value->First Interesting Moment Desc->{{lead.Last Interesting Moment Desc}}
The flow step works but "Last Interesting Moment Desc" is not available as an attribute for the Data Value Changes trigger. Can anyone explain why? I can't find anything about this in Product Docs.