Unsupported performer markup.
Performer differentiation supports plain, italic, bold, and nested bold-italic slots. This literal tag or malformed nesting is preserved for review.
Example
[Verse]
<u>Voice</u>[Verse: A & <i>B</i>]
<i>Voice</i>The fix
In the workbench this finding carries one control, labelled Remove markup. 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:
Use song part headers verified Section headers, performer legends, and four differentiation styles