Diffchecker
The non-upgradeable standard version of OpenZeppelins library, such as Ownable, Pausable, Address, Context, SafeERC20, ERC1967Upgrade etc, are inherited / used by both the proxy and the implementation contracts.
As a result, when attempting to use the upgrades plugin mentioned, the following errors are raised:
Having reviewed these errors, none had any adversarial impact:
Nevertheless, it would be safer to use the upgradeable versions of the library contracts to avoid unexpected behaviour.
Where applicable, use the contracts from @openzeppelin/contracts-upgradeable instead of @openzeppelin/contracts.
