According to the IRS if your return, even an amended one is still processing then you will not receive the advance child tax credit payments. Go to topic Q B 12 as of June 30th there were 35 million US income tax returns that had not been processed and estimated only 3% of phone calls were being answered. Verify that here
The (old) article states :
"... crack down on the wealthy [who cheat on their] taxes.
The latest bipartisan infrastructure deal included more money for the IRS for this purpose."
The Republicans made sure this provision was dropped. They literally said they don't want their wealthy donors to get audited.