Quick answer: Narrative content has its own bug class - dialog ordering, missed character moments, broken scripted events. Narrative-focused bashes catch them.
Narrative bugs are different from gameplay bugs. Test them separately.
Per-character arc test
Test each character's full arc. Surfaces dialog ordering and missed beats.
Branch coverage
Each narrative branch traversed. Choices and consequences verified.
Voice/text sync
Voice line matches subtitle; mismatches surface.
Audit per chapter
Each chapter tagged; narrative bugs tracked per chapter.
“Narrative testing is content testing. Different from systems testing.”
If your game has narrative content, the narrative bash is a quarterly cadence. Plan it.