fix(react-query): remove placeholderData from suspense infinite query

[RezaRahemtola]

🎯 Changes

useSuspenseInfiniteQuery doesn't override placeholderData from QueryClient defaults, so a global placeholderData config (e.g. (prev) => prev) causes the hook to render previous data instead of suspending on queryKey change.

PR #6973 fixed this for useSuspenseQuery and useSuspenseQueries but useSuspenseInfiniteQuery was missed. The result type already omits isPlaceholderData, confirming placeholder data should never appear in suspense results.

Also applied to preact-query (identical code, same bug) and added a regression test mirroring the sibling test from #6973.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

• Bug Fixes

  • Suspense infinite queries now ignore configured placeholder data, ensuring they suspend correctly while loading new results.
  • Updated behavior applies to both React and Preact query integrations.

• Tests

  • Added coverage confirming loading states are shown again when the query key changes, even when placeholder data is configured.

• Chores

  • Added patch release notes for the affected packages.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a4aa1fd9-f81f-4aea-9f5e-f6ebb6cb97e7

📥 Commits

Reviewing files that changed from the base of the PR and between 46d7f02 and 194f65d.

📒 Files selected for processing (4)

• .changeset/useSuspenseInfiniteQuery-placeholderData.md
• packages/preact-query/src/useSuspenseInfiniteQuery.ts
• packages/react-query/src/__tests__/useSuspenseInfiniteQuery.test.tsx
• packages/react-query/src/useSuspenseInfiniteQuery.ts

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📝 Walkthrough

Walkthrough

The suspense infinite query hooks now disable placeholderData. React tests verify suspension after query key changes. A changeset records patch releases for the React and Preact Query packages.

Changes

Suspense infinite query behavior

Layer / File(s)	Summary
Disable placeholder data in suspense hooks packages/react-query/src/useSuspenseInfiniteQuery.ts, packages/preact-query/src/useSuspenseInfiniteQuery.ts	Both hooks pass placeholderData: undefined to useBaseQuery.
Validate behavior and record releases packages/react-query/src/__tests__/useSuspenseInfiniteQuery.test.tsx, .changeset/useSuspenseInfiniteQuery-placeholderData.md	The test verifies suspension during query key changes. The changeset records patch releases for both packages.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: removing placeholderData from suspense infinite queries.
Description check	✅ Passed	The description explains the problem, motivation, affected packages, test coverage, checklist, and changeset impact.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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