https://github.com/ethereum/execution-apis/blob/main/src/engine/shanghai.md
(c.f. https://hackmd.io/@n0ble/rywPcPTci)

Think some changes were introduced for V2 in ethereum/execution-apis#338 which haven't been considered...

https://github.com/ethereum/execution-apis/blob/main/src/engine/shanghai.md#specification

1. Client software MAY NOT validate terminal PoW block conditions during payload validation (point (2) in the Payload validation routine).
2. Client software MUST return {status: INVALID, latestValidHash: null, validationError: errorMessage | null} if the blockHash validation has failed.

https://github.com/ethereum/execution-apis/blob/main/src/engine/shanghai.md#specification-1

1. Client software MAY NOT validate terminal PoW block conditions in the following places:

• during payload validation (point (2) in the Payload validation routine specification),
• when updating the forkchoice state (point (3) in the engine_forkchoiceUpdatedV1 method specification).