RSS Feed/News DuplicateKeyException not caught during Connected Account registration (username conflict)

[ENXF NET]

When a user attempts to register via a connected account at GitHub OAuth, and the chosen username already exists in xf_user, XenForo throws an unhandled XF\Db\DuplicateKeyException (MySQL error 1062) instead of returning a user-friendly validation error.

The registration form accepts the input, passes validation, and only fails at the INSERT stage, resulting in a logged server error visible to admins and a broken experience for the end user.

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