From 853f887bd28e87c767974095a8dc657babdcdced Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Tue, 17 Feb 2026 19:43:10 -0500
Subject: [PATCH] Use proper TeX class for mfenced with open and close
 delimiters

---
 ts/core/MmlTree/MmlNodes/mfenced.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ts/core/MmlTree/MmlNodes/mfenced.ts b/ts/core/MmlTree/MmlNodes/mfenced.ts
index 570bf1510..e6d3851d6 100644
--- a/ts/core/MmlTree/MmlNodes/mfenced.ts
+++ b/ts/core/MmlTree/MmlNodes/mfenced.ts
@@ -96,7 +96,9 @@ export class MmlMfenced extends AbstractMmlNode {
     if (this.close) {
       prev = this.close.setTeXclass(prev);
     }
-    this.updateTeXclass(this.open);
+    if (!this.open || !this.close) {
+      this.updateTeXclass(this.open || this.childNodes[0] || this.close);
+    }
     return prev;
   }