diff --git a/tests/core/pyspec/eth2spec/test/phase0/block_processing/test_process_deposit.py b/tests/core/pyspec/eth2spec/test/phase0/block_processing/test_process_deposit.py
index f1a27f8ec..8922032b4 100644
--- a/tests/core/pyspec/eth2spec/test/phase0/block_processing/test_process_deposit.py
+++ b/tests/core/pyspec/eth2spec/test/phase0/block_processing/test_process_deposit.py
@@ -237,7 +237,7 @@ def test_bad_merkle_proof(spec, state):
 
 @with_all_phases
 @spec_state_test
-def test_key_validate_invalid(spec, state):
+def test_key_validate_invalid_subgroup(spec, state):
     validator_index = len(state.validators)
     amount = spec.MAX_EFFECTIVE_BALANCE
 
@@ -247,3 +247,19 @@ def test_key_validate_invalid(spec, state):
     deposit = prepare_state_and_deposit(spec, state, validator_index, amount, pubkey=pubkey, signed=True)
 
     yield from run_deposit_processing(spec, state, deposit, validator_index)
+
+
+@with_all_phases
+@spec_state_test
+def test_key_validate_invalid_decompression(spec, state):
+    validator_index = len(state.validators)
+    amount = spec.MAX_EFFECTIVE_BALANCE
+
+    # `deserialization_fails_infinity_with_true_b_flag` BLS G1 deserialization test case.
+    # This pubkey would not pass `bls.KeyValidate`, but `process_deposit` would not throw exception.
+    pubkey_hex = 'c01000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
+    pubkey = bytes.fromhex(pubkey_hex)
+
+    deposit = prepare_state_and_deposit(spec, state, validator_index, amount, pubkey=pubkey, signed=True)
+
+    yield from run_deposit_processing(spec, state, deposit, validator_index)