Performer legend styles are out of slot order.

Section-local performer groups should appear in plain, italic, bold, then bold-italic order. Shifting them into order rewrites the legend and the section's formatting as one edit, so every group keeps its own performers.

Example

[Chorus: A, <b>B</b> & <i>C</i>]
Line

[Chorus: A, <i>B</i> & <b>C</b>]
Line

The fix

In the workbench this finding carries one control, labelled Reorder legend groups. The change is contextual, so it is previewed as a diff in your document first and applies only when you confirm it.

Source

The guideline this rule enforces, as cited on every finding it reports: