We are facing an issue with trying to test an upgrade of our live deployed proxies via
upgradeProxy with the error:
Error: Deployment at address 0xDc4db.... is not registered.
The UUPS proxy has been deployed via hardhat/hardhat-deploy. Due to lack of support for UUPS proxies, we are not aware of a way to upgrade a UUPS proxy via hardhat-deploy.
Existing issue discussion proposed to manually copying over into a
mainnet.json file but these solutions seem only to work for Truffle.