Sadly the IRS did not follow their own instructions all the time and some folks didn't get all the stimulus they were expecting and many of the 1444 & 1444b forms didn't seem to make it either. All you can do is apply for the missing money on the 2020 return which is added to your regular refund. When the IRS will send the money is TBD ... check the IRS WMR? tool every couple of days for a progress report.
