[BUG] duplicate-object-key warnings during preview after upgrading to Next.js 16

[gwen31792]

Describe the bug

Reproduction repo: https://github.com/gwen31792/ehentai-toplist-archive

Running the command pnpm nx preview web on commit 364195e7a6a24f056e1f97221f2f69affb783929 (which upgrades Next.js to 16) results in the following warnings:

▲ [WARNING] Duplicate key "options" in object literal [duplicate-object-key]

    .open-next/server-functions/default/apps/web/handler.mjs:236:105622:
      236 │ ...ta:{...i11,placement:g11}}},options:[c10,d10]},F3&&{name:"shif...
          ╵                                ~~~~~~~

  The original key "options" is here:

    .open-next/server-functions/default/apps/web/handler.mjs:236:105309:
      236 │ ...,middleware:[{name:"offset",options:e10=c10={mainAxis:z2+V2,al...
          ╵                                ~~~~~~~


▲ [WARNING] Duplicate key "options" in object literal [duplicate-object-key]

    .open-next/server-functions/default/apps/web/handler.mjs:236:107271:
      236 │ ...ed:{[m11]:e11,[l11]:f11}}}},options:[i10,j10]},F3&&{name:"flip...
          ╵                                ~~~~~~~

  The original key "options" is here:

    .open-next/server-functions/default/apps/web/handler.mjs:236:105659:
      236 │ ...c10,d10]},F3&&{name:"shift",options:k10=i10={mainAxis:!0,cross...
          ╵                                ~~~~~~~


▲ [WARNING] Duplicate key "options" in object literal [duplicate-object-key]

    .open-next/server-functions/default/apps/web/handler.mjs:236:109368:
      236 │ ...:{placement:c12}}}return{}},options:[l10,m10]},{name:"size",op...
          ╵                                ~~~~~~~

  The original key "options" is here:

    .open-next/server-functions/default/apps/web/handler.mjs:236:107307:
      236 │ ...[i10,j10]},F3&&{name:"flip",options:n10=l10={...Z2},async fn(a...
          ╵                                ~~~~~~~


▲ [WARNING] Duplicate key "options" in object literal [duplicate-object-key]

    .open-next/server-functions/default/apps/web/handler.mjs:236:110839:
      236 │ ...ight?{reset:{rects:!0}}:{}},options:[o2,p2]},R4&&{name:"arrow"...
          ╵                                ~~~~~~~

  The original key "options" is here:

    .open-next/server-functions/default/apps/web/handler.mjs:236:109400:
      236 │ ...ons:[l10,m10]},{name:"size",options:q2=o2={...Z2,apply:({eleme...
          ╵                                ~~~~~~~


▲ [WARNING] Duplicate key "options" in object literal [duplicate-object-key]

    .open-next/server-functions/default/apps/web/handler.mjs:236:111145:
      236 │ ...1,padding:c11}).fn(a11):{}},options:[r2,s2]},dX({arrowWidth:U2...
          ╵                                ~~~~~~~

  The original key "options" is here:

    .open-next/server-functions/default/apps/web/handler.mjs:236:110874:
      236 │ ...:[o2,p2]},R4&&{name:"arrow",options:t2=r2={element:R4,padding:...
          ╵                                ~~~~~~~


▲ [WARNING] Duplicate key "options" in object literal [duplicate-object-key]

    .open-next/server-functions/default/apps/web/handler.mjs:236:111671:
      236 │ ...V(c12)}}}default:return{}}},options:[u3,v3]}]}),[ad2,ae2]=dY(a...
          ╵                                ~~~~~~~

  The original key "options" is here:

    .open-next/server-functions/default/apps/web/handler.mjs:236:111214:
      236 │ ...eight:V2}),J2&&{name:"hide",options:w3=u3={strategy:"reference...
          ╵                                ~~~~~~~


⎔ Starting local server...
[wrangler:info] ✨ Parsed 1 valid header rule.
[wrangler:info] Ready on http://localhost:8787

However, these warnings were not present in the previous commit 167248608045c2afca6fee1c861f18131766bb1c.

Steps to reproduce

NOP

Expected behavior

NOP

@opennextjs/cloudflare version

1.13.1

Wrangler version

4.49.0

next info output

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Thu Jun  5 18:30:46 UTC 2025
  Available memory (MB): 31665
  Available CPU cores: 16
Binaries:
  Node: 24.11.0
  npm: 11.6.1
  Yarn: N/A
  pnpm: 10.23.0
Relevant Packages:
  next: 16.0.3 // Latest available version is detected (16.0.3).
  eslint-config-next: N/A
  react: 19.2.0
  react-dom: 19.2.0
  typescript: 5.9.3
Next.js Config:
  output: N/A

Additional context

No response

[vicb]

This looks like a warning in a dependencies, not much we can do for now here
(For architectural reasons, it would be a bit complex to filter out those warnings so it is not high on the todo list)