Use this pattern when a workflow condition appears correct but still skips expected records.
When Unchecked Does Not Equal F
Symptom: A new checkbox field can evaluate as null on existing records, not F. If your workflow condition checks only MY_FIELD = F, those records may not match until they are updated.
Why it happens: Newly added checkbox fields on untouched records often remain null-valued until a write occurs.
Practical fix: Run a mass update on existing records so the checkbox value is explicitly set and workflow conditions evaluate consistently.