Fix #4127 Remove macro star when rendering MathJax

src/preview/math/mathpreviewlib/newcommandfinder.ts

@@ -64,7 +64,13 @@ function parseAst(content: string, node: Ast.Node): string[] {
             lastContent = lastArg.content[lastArg.content.length - 1]
         }
         const end = (lastArg.content[lastArg.content.length - 1].position?.end.offset ?? -1 - closeBraceOffset) + closeBraceOffset
-        macros.push(content.slice(start, end + 1).replaceAll(/\\providecommand([^a-zA-Z])/g, '\\newcommand$1'))
+        macros.push(
+            content.slice(start, end + 1)
+                // Change providecommand to newcommand
+                .replaceAll(/^\\providecommand([^a-zA-Z])/g, '\\newcommand$1')
+                // Remove the star as MathJax does not support #4127
+                .replaceAll(/^\\([a-zA-Z]+)\*/g, '\\$1')
+        )
     }
 
     if ('content' in node && typeof node.content !== 'string') {