Hi @ccolorado,
OpenZeppelin CLI included upgrade safety checks.
Now that CLI support has ended (see: Building for interoperability: why we’re focusing on Upgrades Plugins), I would recommend migrating to the Upgrades Plugins. Primarily to benefit from the tooling for test and deployment, including the upgrade safety checks. Also to avoid using a project that is no longer supported.
I wasn't able to reproduce the error in https://github.com/OpenZeppelin/openzeppelin-upgrades/issues/279 (yet) but we can continue that discussion in the issue.