As @KrisD15 noted, TurboTax does not automatically populate the amount you received for the 3rd stimulus payment. Instead, it assumes your payment amount is $0 (since the box is empty until you populate it) and estimates the full amount included in your refund. When you complete the box with the amount you already received, it is merely removing that amount from your refund to properly reflect that you already received. It is not calculating it as taxable.
@Stardust818504
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