fix(form-core): Validate fields without instances

[kusiewicz]

🎯 Changes

Fixes: #1865

So far, in case when there was no field instance - validation was not run for a given field.
Explicit call to form validation will not be expensive, so it will be better to have this as fallback than nothing at all.

✅ Checklist

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

🚀 Release Impact

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

[changeset-bot]

🦋 Changeset detected

Latest commit: e710f91

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@tanstack/form-core	Patch
@tanstack/angular-form	Patch
@tanstack/form-devtools	Patch
@tanstack/lit-form	Patch
@tanstack/react-form	Patch
@tanstack/solid-form	Patch
@tanstack/svelte-form	Patch
@tanstack/vue-form	Patch
@tanstack/react-form-devtools	Patch
@tanstack/solid-form-devtools	Patch
@tanstack/react-form-nextjs	Patch
@tanstack/react-form-remix	Patch
@tanstack/react-form-start	Patch

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---

☁️ Nx Cloud last updated this comment at 2026-01-17 16:52:12 UTC

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@tanstack/react-form-start

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@tanstack/solid-form

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@tanstack/solid-form-devtools

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commit: e710f91

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.48%. Comparing base (6892ed0) to head (e710f91).
⚠️ Report is 121 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2001      +/-   ##
==========================================
- Coverage   90.35%   89.48%   -0.87%     
==========================================
  Files          38       48      +10     
  Lines        1752     1950     +198     
  Branches      444      491      +47     
==========================================
+ Hits         1583     1745     +162     
- Misses        149      184      +35     
- Partials       20       21       +1     

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