`export_undef` when exporting from a `<script module>`

[huntabyte]

Describe the bug

Starting in Svelte v5.5.0, when exporting from a <script module> the compiler gives an export_undef error that didn't exist in earlier versions.

We aren't able to build our apps on 5.5+ because of this.

Assuming this was introduced alongside #14315 ?

Reproduction

REPL (latest 5.9.0)
REPL (break introduced 5.5.0)
REPL (last working 5.4.0)

Check the Another.svelte file for the error.

Logs

No response

System Info

REPL

Severity

blocking an upgrade