PS- I'm backfilling through the Analysis tab on the Element I want to analyze, not the management tab as it is not installed on the system I'm using.
I discovered the issue was with a datatype mismatch on my start trigger that was't readily apparent. The underlying BATCH_SEQ attribute was a float16 and the equality operator was behaving inconsistently.
Original Start Trigger (not real numbers):
'BATCH_SEQ' = 10
New Start Trigger:
Round('BATCH_SEQ') = 10
The blind spot in my root cause analysis was that the current value of 'BATCH_SEQ' (20), would cause the following expression to evaluate to true, leading me to believe that my start trigger syntax was correct and complete:
'BATCH_SEQ' = 20