disable render when __NEXT_DEV_INDICATOR

packages/next/src/client/components/react-dev-overlay/_experimental/internal/container/runtime-error/render-error.tsx

@@ -109,7 +109,18 @@ const RenderRuntimeError = ({ children, state, isAppDir }: Props) => {
     }
   }, [nextError, isAppDir])
 
-  return children({ readyErrors, totalErrorCount: readyErrors.length })
+  // Stringify since __NEXT_DEV_INDICATOR can be set to boolean false.
+  const hasDisabledDevIndicator =
+    process.env.__NEXT_DEV_INDICATOR?.toString() === 'false'
+  const totalErrorCount = readyErrors.length
+
+  // Even if the dev indicator is disabled, we should show it
+  // along with the error overlay when there are errors.
+  if (hasDisabledDevIndicator && !totalErrorCount) {
+    return null
+  }
+
+  return children({ readyErrors, totalErrorCount })
 }
 
 const RenderBuildError = ({ children }: Props) => {