Script and prompt are two layers

The description and the dialogue are what you read. The image prompt is what the model draws. They drift the moment you change a coat or a line and leave the prompt alone. The stale-prompt warning is the studio telling you which layer will win.

Regenerate the comic prompt on that panel when you want a fresh prompt from the current fields without rewriting them by hand.

Fields that change the next image

FieldUse it for
Scene typeInterior, exterior, and the kind of beat
CharactersWho must appear, matched to cast rows
DescriptionWhat the picture shows
DialogueSpoken lines, one per row
NarrationCaption or voiceover
Sound effectsOn-image SFX, separated by commas
Image prompt / negativeThe actual draw instruction

A dialogue tweak you only wanted in the script still needs a new image if the letters are baked into the picture. Refine is the shorter path when the picture is close and only the line, face, or pose should move.