useBlocker was receiving a boolean, which caused it to block the settings
form's own POST submission before the onSubmit state-clear could propagate.
Switching to a BlockerFunction that checks nextLocation.pathname lets
same-URL form posts through, so the "leave without saving?" dialog only
fires on genuine navigation away from the settings page.
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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