Nextjs 15 with dynamicIO: true renders RSC 3 times

[yudistiraashadi]

Link to the code that reproduces this issue

https://stackblitz.com/~/github.com/yudistiraashadi/nextjs-15-canary-dynamicio-bug

To Reproduce

1. pnpx create-next-app@canary
2. enable dynamicIO: true on next.config.ts
3. add console.log("something") on the initial template page.tsx and see the console.log runs 3 times
4. Tried with pnpm and npm, same result

Current vs. Expected behavior

Run RSC 1 time only. Without dynamicIO: true it runs 1 time

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #48~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct  7 11:24:13 UTC 2
  Available memory (MB): 15731
  Available CPU cores: 20
Binaries:
  Node: 20.18.0
  npm: 10.8.2
  Yarn: N/A
  pnpm: 9.13.2
Relevant Packages:
  next: 15.0.4-canary.19 // Latest available version is detected (15.0.4-canary.19).
  eslint-config-next: 15.0.4-canary.19
  react: 19.0.0-rc-380f5d67-20241113
  react-dom: 19.0.0-rc-380f5d67-20241113
  typescript: 5.6.3
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

dynamicIO

Which stage(s) are affected? (Select all that apply)

next dev (local)

Additional context

No response

[samcx]

@yudistiraashadi I was able to replicate. We are taking a look!