fix: check test error state

[g3john]

What this PR does / why we need it

Context

• [Switches from Script to Execution when it shouldn't]: Fix race condition in useFormNavigationState where errors state lagged formErrors by one render cycle
• [Doesn't switch from Execution to Script when it should]: Fix BROWSER_CHECK_FIELDS registering 'instance' instead of 'target', causing the target field to be unhandled by sectionByErrors on Browser checks.

Screen.Recording.2026-02-18.at.9.59.39.AM.mov

[github-actions]

Script size changes

Name	+/-	Main	This PR	Outcome
[217.js]	=	2,190.00 kB	2,190.00 kB	✅
[361.js]	=	801.07 kB	801.08 kB	✅
[datasource/module.js]	=	25.25 kB	25.25 kB	✅
[692.js]	=	20.64 kB	20.64 kB	✅
[663.js]	=	5.83 kB	5.83 kB	✅
[module.js]	=	4.59 kB	4.59 kB	✅
[156.js]	=	1.90 kB	1.90 kB	✅

Totals

Name	+/-	Main	This PR	Outcome
[Scripts]	=	3,049.27 kB	3,049.29 kB	✅
[Non-script Assets]	=	2,679.89 kB	2,679.89 kB	✅
[All]	=	5,729.16 kB	5,729.18 kB	✅

Generated by 🚫 dangerJS against 4e8c6f3

[ckbedwell]

Great job! Can we update it so that the test button engages the validation in the stepper too like it does with the save button and manual navigation?

[github-actions]

TruffleHog Scan Results

No secrets detected in this PR.

[g3john]

Great job! Can we update it so that the test button engages the validation in the stepper too like it does with the save button and manual navigation?

Updated the PR description video with the change

[VikaCep]

👏 👏 👏

[ckbedwell]

LGTM! 👏