Turbopack: dynamic cyclical import causes infinite loop

### Link to the code that reproduces this issue https://github.com/maxpatiiuk/turbopack-dynamic-import-freeze ### To Reproduce 1. Clone the repository ```sh git clone https://github.com/maxpatiiuk/turbopack-dynamic-import-freeze.git cd turbopack-dynamic-import-freeze ``` OR: [use the Stackblitz reproduction](https://stackblitz.com/edit/stackblitz-starters-zhr4zkta?file=app%2Fcomponents%2FTest.tsx,app%2Fpage.tsx,package.json,app%2Flayout.tsx) (but hard to debug in such environment): 2. Install dependencies ```sh npm install ``` 3. Run the development server ```sh npx next dev --turbopack # or: # CAUTION: the tracing file grows quickly, without limits NEXT_TURBOPACK_TRACING=1 npx next dev --turbopack ```  ### Current vs. Expected behavior If a module dynamically imports another module, which in turn dynamically imports the first module, Turbopack gets into a loop (100% CPU usage, trace file grows indefinitely). My best minimal reproduction is in `app/page.tsx`, where a single library entrypoint import causes the loop. I also attached the trace-turbopack file: [trace-turbopack.zip](https://github.com/user-attachments/files/23006283/trace-turbopack.zip) Note it grows indefinitely, so I killed the process shortly after starting it to make the file uploadable to GitHub. ### Provide environment information ```bash (also reproducible in Stackblitz) Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:29 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6000 Available memory (MB): 32768 Available CPU cores: 10 Binaries: Node: 22.19.0 npm: 10.9.3 Yarn: 1.22.19 pnpm: 8.9.0 Relevant Packages: next: 15.5.6 // Latest available version is detected (15.5.6). eslint-config-next: N/A react: 19.2.0 react-dom: 19.2.0 typescript: 5.9.3 Next.js Config: output: N/A ``` ##…