As a California resident, all of your income is taxable by California regardless of what state you earned it in. If you had earned income in another state with an income tax, this would matter. You would also owe tax to that state and then California would issue you a credit based on the amount of tax you paid to the other state. However, since you earned the income in Washington state, which has no state income tax, there is no additional state tax paid, and therefore no credit for tax paid to another state.
All of your income is taxable by California. You don't need a corrected W-2.
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