What a Decision step keeps in Task.Configuration.decision: its spec configuration, plus the name conditions use for it.
Task.Configuration.decision
The node's tempId in the submitted spec — the <step> in decisions.<step>.<question>.
tempId
<step>
decisions.<step>.<question>
Stored because nothing else survives submission: Task rows have real IDs, and the tempIds the conditions were written against are otherwise gone.
What a Decision step keeps in
Task.Configuration.decision: its spec configuration, plus the name conditions use for it.