[Bug]: esm default import with shared does not properly access the default function

[jmvtrinidad]

System Info

System:
OS: macOS 15.0
CPU: (12) arm64 Apple M2 Pro
Memory: 74.30 MB / 32.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 22.4.0 - ~/.nvm/versions/node/v22.4.0/bin/node
npm: 10.8.1 - ~/.nvm/versions/node/v22.4.0/bin/npm
pnpm: 9.11.0 - ~/.nvm/versions/node/v22.4.0/bin/pnpm
bun: 1.1.4 - ~/.bun/bin/bun
Browsers:
Chrome: 129.0.6668.90
Edge: 129.0.2792.65
Safari: 18.0
npmPackages:
@rspack/cli: ^1.0.2 => 1.0.5
@rspack/core: ^1.0.2 => 1.0.5
@rspack/dev-server: ^1.0.2 => 1.0.5
@rspack/plugin-minify: ^0.7.5 => 0.7.5
@rspack/plugin-react-refresh: ^1.0.0 => 1.0.0

Details

orginal code from react calendar

generated code from rspack

Reproduce link

1. Clone the repository: git clone git@github.com:jmvtrinidad/issues.git
2. Checkout the branch: git checkout rspackDefaultExportIssue
3. Serve the app: nx serve host
4. Build the app with react calendar - it still works.
5. Install clsx - the issue appears, failing to infer the correct module.

Reproduce Steps

Works without clsx:

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Fails with clsx:

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Additional Context

Prior to switching to rspack, webpack produced the following outputs:

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