Yes. Because you claimed your child on your 2020 tax return, the IRS will automatically disburse advance Child Tax Credit payments to you even though you know you won't be claiming your child on your 2021 tax return. When you file your 2021 tax return (the one due in April of 2022), you could have to pay back the advance payments in excess of the Child Tax Credit you're entitled to claim on that return. You may be excused from repaying some or all of the excess amount if you qualify for repayment protection. For more information about repayment protection, see Topic H: Reconciling Your Advance Child Tax Credit Payments on Your 2021 Tax Return.
If you know you won't be claiming the Child Tax Credit on your 2021 return, then you should go to the IRS website to unenroll from receiving monthly payments using the Child Tax Credit Update Portal (CTC UP). If things change again and you are entitled to the Child Tax Credit for 2021, you can claim the full amount on your tax return when you file next year.
https://www.irs.gov/credits-deductions/2021-child-tax-credit-and-advance-child-tax-credit-payments-topic-m-commonly-asked-shared-custody-questions