Type error in expo router Link href when using route group

I was doing the official Expo tutorial when I encountered a type error. I had a <Link> in my +not-found route that linked to the root directory. When I moved the routes into a route group called (tabs), the href gave this error:

Type '"/"' is not assignable to type"

Here is my +not-found.tsx:

import { View, StyleSheet } from 'react-native';
import { Link, Stack } from 'expo-router';

export default function NotFoundScreen() {
  return (
    <>
      <Stack.Screen options={{ title: 'Oops! Not Found' }} />
      <View style={styles.container}>
        <Link href="/" style={styles.button}>
          Go back to Home screen!
        </Link>
      </View>
    </>
  );
}

My root layout:

export default function RootLayout() {
  return (
    <Stack>
      <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
    </Stack>
  );
}

There is an index.tsx file in the (tabs) folder, and at runtime everything runs with no problem.

Any help understanding what's happening would be appreciated.