get right parentblockhash on local blocks

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_execution_payload.go

@@ -273,6 +273,9 @@ var errNoTerminalBlockHash = errors.New("no terminal block hash")
 //
 // Otherwise, the terminal block hash is fetched based on the slot's time, and an error is returned if it doesn't exist.
 func (vs *Server) getParentBlockHash(ctx context.Context, st state.BeaconState, slot primitives.Slot) ([]byte, error) {
+	if st.Version() >= version.EPBS {
+		return st.LatestBlockHash()
+	}
 	if st.Version() >= version.Capella {
 		return getParentBlockHashPostCapella(st)
 	}