4.0-next: Unterminated JSX contentssvelte(js_parse_error)

[niemyjski]

Describe the bug

Getting Unterminated JSX contents after upgrading to 4.0 preview.

 let sortedHeaders = $derived(
        Object.keys(request.headers || {})
            .sort()
            .reduce(
                (acc, key) => {
                    acc[key] = request.headers?.[key].join(',') ?? '';
                    return acc;
                },
                <Record<string, string>>{}
            )
    );

Reproduction URL

https://github.com/exceptionless/Exceptionless/tree/main/src/Exceptionless.Web/ClientApp

Reproduction

Build the project

Logs

No response

System Info

System:
    OS: Windows 11 10.0.22631
    CPU: (24) x64 AMD Ryzen 9 5900X 12-Core Processor
    Memory: 8.38 GB / 31.91 GB
  Binaries:
    Node: 22.8.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.8.3 - ~\AppData\Roaming\npm\npm.CMD
    pnpm: 9.9.0 - C:\ProgramData\chocolatey\bin\pnpm.EXE
  Browsers:
    Edge: Chromium (127.0.2651.86)
    Internet Explorer: 11.0.22621.3527
  npmPackages:
    @sveltejs/adapter-static: ^3.0.4 => 3.0.4
    @sveltejs/kit: ^2.5.26 => 2.5.26
    @sveltejs/vite-plugin-svelte: ^4.0.0-next.7 => 4.0.0-next.7
    svelte: ^5.0.0-next.244 => 5.0.0-next.244
    vite: ^5.4.4 => 5.4.4

[Conduitry]

Duplicate of sveltejs/svelte#13179