# Upstream: https://github.com/facebook/react-native/issues/54642 (open fix in #54952 returns 1.0 instead of reading the trait collection)
diff --git a/React/Base/RCTUtils.mm b/React/Base/RCTUtils.mm
index ba4e930..8622e31 100644
--- a/React/Base/RCTUtils.mm
+++ b/React/Base/RCTUtils.mm
@@ -384,7 +384,21 @@ CGFloat RCTFontSizeMultiplier(void)
     };
   });
 
-  return mapping[RCTSharedApplication().preferredContentSizeCategory].floatValue;
+  // `RCTSharedApplication()` is nil in an app extension, where the trait collection carries the same
+  // preference — the way `RCTScreenScale()` above already reads `displayScale` from it. Without a
+  // category the lookup yields nothing and the multiplier is zero, which sizes every font to zero: a
+  // named font then draws nothing at all, while the system font quietly falls back to its default
+  // size, so the text that disappears is exactly the text that asked for a `fontFamily`.
+  UIApplication *application = RCTSharedApplication();
+  UIContentSizeCategory contentSizeCategory = application != nil
+      ? application.preferredContentSizeCategory
+      : UITraitCollection.currentTraitCollection.preferredContentSizeCategory;
+
+  CGFloat multiplier = contentSizeCategory != nil ? mapping[contentSizeCategory].floatValue : 0.0;
+
+  // Nothing usable came back: `UIContentSizeCategoryUnspecified` is not in the mapping, and neither
+  // is a trait collection read off the main thread, where UIKit has none to give.
+  return multiplier > 0 ? multiplier : 1.0;
 }
 
 #if !TARGET_OS_TV