only give counter-weight penalty if leak. TMP

specs/altair/beacon-chain.md

@@ -407,6 +407,8 @@ def get_inactivity_penalty_deltas(state: BeaconState) -> Tuple[Sequence[Gwei], S
     previous_epoch = get_previous_epoch(state)
     matching_target_indices = get_unslashed_participating_indices(state, TIMELY_TARGET_FLAG_INDEX, previous_epoch)
     for index in get_eligible_validator_indices(state):
+        if is_in_inactivity_leak(state):
+            # TODO: to be removed in PR 2399
             for (_, weight) in get_flag_indices_and_weights():
                 # This inactivity penalty cancels the flag reward corresponding to the flag index
                 penalties[index] += Gwei(get_base_reward(state, index) * weight // WEIGHT_DENOMINATOR)