Function validate_block_access_list_presence 

pub fn validate_block_access_list_presence(
    version: EngineApiMessageVersion,
    message_validation_kind: MessageValidationKind,
    has_block_access_list: bool,
) -> Result<(), EngineObjectValidationError>

Available on crate feature node-api only.

Validates the presence of the block access list field for the engine method version.

engine_newPayloadV5 and engine_newPayloadV6 take an ExecutionPayloadV4, so the field must be Some; every other method must leave it None. Presence does not depend on the payload timestamp, so a well-formed payload outside the method’s fork reaches the fork check in validate_payload_timestamp and fails with -38005: Unsupported fork.