rsc plugin unit test is flaky

[hi-ogawa]

We are getting this error for some time now https://github.com/vitejs/vite-plugin-react/actions/runs/20707908880/job/59441944055#step:8:24

Run pnpm -C packages/plugin-rsc test

> @vitejs/plugin-rsc@0.5.10 test /home/runner/work/vite-plugin-react/vite-plugin-react/packages/plugin-rsc
> vitest


 RUN  v4.0.16 /home/runner/work/vite-plugin-react/vite-plugin-react/packages/plugin-rsc

 ✓ src/transforms/wrap-export.test.ts (17 tests) 29ms
 ✓ src/transforms/hoist.test.ts (10 tests) 33ms
 ✓ src/transforms/waku.test.ts (13 tests) 36ms
 ✓ src/transforms/proxy-export.test.ts (10 tests) 28ms
 ❯ src/plugins/scan.test.ts (1 test | 1 failed) 4ms
     × basic 3ms
 ✓ src/transforms/cjs.test.ts (6 tests) 86ms

⎯⎯⎯⎯⎯⎯⎯ Failed Tests 1 ⎯⎯⎯⎯⎯⎯⎯

 FAIL  src/plugins/scan.test.ts > transformScanBuildStrip > basic
TypeError: object is not iterable (cannot read property Symbol(Symbol.iterator))
 ❯ transformScanBuildStrip src/plugins/scan.ts:29:21
     27| 
     28| export async function transformScanBuildStrip(code: string): Promise<s…
     29|   const [imports] = esModuleLexer.parse(code)
       |                     ^
     30|   let output = imports
     31|     .map((e) => e.n && `import ${JSON.stringify(e.n)};\n`)
 ❯ src/plugins/scan.test.ts:16:18

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/1]⎯


 Test Files  1 failed | 5 passed (6)
      Tests  1 failed | 56 passed (57)
   Start at  07:12:43
   Duration  918ms (transform 225ms, setup 0ms, import 1.51s, tests 216ms, environment 1ms)