Worked on enhancing the reliability of the Polygon Bor client by developing and integrating a regression test within the maticnetwork/bor repository. Focused on the BlockSTM V2 execution path, the work targeted nondeterministic behavior arising from scenarios involving self-destruct and native value transfers, which could lead to mismatched receipt logs. Leveraging Go and blockchain testing techniques, the regression test was relocated into the core test suite to align with existing parity tests, improving traceability and coverage. This approach enabled earlier detection and debugging of parallel execution issues, contributing to greater stability and reduced risk in Ethereum Virtual Machine–based environments.