EL client behaviour unspecified when calling V1 methods post-Shanghai

[fgimenez]

The execution specs only states that V1 versions of engine_newPayloadV1 and engine_forkChoiceUpdateV1 should be validated by the consensus client, the execution client behaviour is not specified.

[HNYuuu]

This issue had been recognized in geth and patched at: ethereum/go-ethereum#33918