Filter ExceptionsManager.reportException duplicates in app-start init

CHANGELOG.md

@@ -19,6 +19,7 @@
 
 ### Fixes
 
+- Fix duplicate JS error reporting on iOS New Architecture when the native SDK is initialized early via `sentry.options.json` ("Capture App Start Errors"). It's done by applying the `ExceptionsManager.reportException` C++ wrapper filter in both init paths ([#6145](https://github.com/getsentry/sentry-react-native/pull/6145))
 - Fix boolean options from `sentry.options.json` being ignored on Android when using `RNSentrySDK.init` ([#6130](https://github.com/getsentry/sentry-react-native/pull/6130))
 
 ### Dependencies

packages/core/ios/RNSentryStart.m

@@ -203,6 +203,14 @@ + (void)updateWithReactFinals:(SentryOptions *)options
             return nil;
         }
 
+        for (SentryException *exception in event.exceptions) {
+            if (nil != exception.value &&
+                [exception.value rangeOfString:@"ExceptionsManager.reportException"].location
+                    != NSNotFound) {
+                return nil;
+            }
+        }
+
         [self setEventOriginTag:event];
         if (userBeforeSend == nil) {
             return event;