See test case estimate-with-eip-7702.io: https://github.com/ethereum/execution-apis/blob/main/tests/eth_estimateGas/estimate-with-eip7702.io
In nimbus EL, the second method call there does not return {"jsonrpc":"2.0","id":2,"result":"0xb52e"} but {"jsonrpc":"2.0","id":1,"result":"0x5208"}.
It does not seem to fail in hive rpc-compat however, I think perhaps because of // speconly: client response is only checked for schema validity. ?