Need to File Amended Return for $12,774 Unemployment Income Received on Form 1099-G After Already Filing 2021 Taxes

Just got Form 1099-G in the mail from the Georgia Department of Labor and I'm super confused. Already filed my taxes for 2021 but now I got this form showing my unemployment compensation. Not sure if this means I owe money back to the IRS or if I'm getting additional money. The form shows: GEORGIA DEPARTMENT OF LABOR 148 ANDREW YOUNG INTERNATIONAL BLVD., ATLANTA, GA. 30303-1751 FED-ID 58-6002009 STA-ID 4413776-XB Form 1099-G (2021) Box 1 Unemployment Compensation: $12,774.00 Box 4 Federal Income Tax Withheld: $325.00 Box 5 ATAA/RTAA Payments: $0.00 Box 11 State Income Tax Withheld: $235.00 The instructions say "This is important tax information and is being furnished to the Internal Revenue Service. If you are required to file a return, a negligence penalty or other sanction will be imposed on you if this income is taxable and the IRS determines that it has not been reported." It also says I need to "Report this amount as income on the unemployment compensation line of your income tax return." I already filed my taxes for the year but didn't include this unemployment income. Anyone know what this actually means for my tax situation? Do I need to file an amended return now? Will I owe penalties since I didn't include almost $13K of unemployment compensation? The Georgia Department of Labor apparently withheld some taxes, but I'm not sure if that's enough to cover what I should have paid.