unable to get local issuer certificate during partial chain verification
X509 Certificate Chain Validation When utilizing X509_V_FLAG_PARTIAL_CHAIN via X509_VERIFY_PARAM_set_flags , OpenSSL allows a certificate chain to be verified as valid if any intermediate CA in the chain is present in the trust store, rather than requiring the root CA. In OpenSSL 3.0 and later, the introduction of the provider-based architecture changes how