“It was working yesterday.”
He said it like that settled everything.
Checked deployments… Nothing.
Checked flows… Found one named “Final_v3_Updated_NEW.” Not promising.
Checked logs…. There it was.
Validation rule firing from a field updated by a flow… triggered by another flow… tied to a field no one owns anymore.
Asked again when it broke.
“Yesterday.”
Fixed it in 10 minutes.
Probably hadn’t worked in months.

