@sthom, so this is actually a thing.
I first noticed it this past weekend when I went to pick up my mom's prescriptions at CVS. There was a sign on the window asking people to please use exact change if possible and refrain from using large bills because the store was short on change due to a cap imposed by the Federal Reserve.
This really struck me, so I did some Googling and found that the U.S. Treasury has been having issues with the circulation of coins ever since the pandemic started. They even created a U.S. Coin Task Force last summer to address disruptions in circulation.
According to this post by the U.S. Treasury: "There is currently an adequate overall amount of coins in the economy. But business and bank closures associated with the COVID-19 pandemic significantly disrupted normal circulation patterns for U.S. coins."
It's pretty fascinating stuff to read about!