Parcel --lazy mode bug

Repro steps:

1. pnpm install
2. pnpm run dev aka ./node_modules/.bin/parcel serve --lazy
3. open http://localhost:1234/a.html ✅
4. open http://localhost:1234/b.html ❌ fails with Uncaught Error: Cannot find module '39ddc'
5. open http://localhost:1234/b.html again ✅