diff --git a/.github/workflows/coverage.yaml b/.github/workflows/coverage.yaml
index 51806091f33..6cb7a2c285f 100644
--- a/.github/workflows/coverage.yaml
+++ b/.github/workflows/coverage.yaml
@@ -133,7 +133,7 @@ jobs:
           ./.github/scripts/fill_introduced_tests.sh "$CHANGED_TEST_FILES" "${{ github.workspace }}/evmtest_coverage/coverage/PATCH_TESTS" "${{ env.BLOCK_GAS_LIMIT }}" "${{ env.FILL_UNTIL }}"
 
       - name: Parse and fill introduced test sources from before the PR
-        if: ${{ (steps.changed-tests.outputs.tests_any_modified == 'true' || steps.changed-tests.outputs.tests_any_deleted == 'true') && steps.ported-from.outputs.any_ported == 'false' }}
+        if: ${{ (steps.changed-tests.outputs.tests_modified_files_count != '0' || steps.changed-tests.outputs.tests_deleted_files_count != '0') && steps.ported-from.outputs.any_ported == 'false' }}
         id: pre-patch-fill
         env:
           MODIFIED_TEST_FILES: ${{ steps.changed-tests.outputs.tests_modified_files }}
diff --git a/tests/zkevm/test_worst_opcode.py b/tests/zkevm/test_worst_opcode.py
new file mode 100644
index 00000000000..74697f5637c
--- /dev/null
+++ b/tests/zkevm/test_worst_opcode.py
@@ -0,0 +1,79 @@
+"""
+abstract: Tests zkEVMs worst-case opcode scenarios.
+    Tests zkEVMs worst-case opcode scenarios.
+
+Tests running worst-case opcodes scenarios for zkEVMs.
+"""
+
+import pytest
+
+from ethereum_test_forks import Fork
+from ethereum_test_tools import (
+    Alloc,
+    Environment,
+    StateTestFiller,
+    Transaction,
+)
+from ethereum_test_tools.vm.opcode import Opcodes as Op
+from ethereum_test_vm.opcode import Opcode
+
+from .helpers import code_loop_precompile_call
+
+
+@pytest.mark.parametrize(
+    "opcode",
+    [
+        pytest.param(Op.LOG0, id="log0"),
+        pytest.param(Op.LOG1, id="log1"),
+        pytest.param(Op.LOG2, id="log2"),
+        pytest.param(Op.LOG3, id="log3"),
+        pytest.param(Op.LOG4, id="log4"),
+    ],
+)
+@pytest.mark.parametrize(
+    "size",
+    [
+        0,  # 0 bytes
+        1024 * 1024,  # 1MiB
+    ],
+)
+@pytest.mark.parametrize("empty_topic", [True, False])
+@pytest.mark.parametrize("fixed_offset", [True, False])
+def test_worst_log_opcodes(
+    state_test: StateTestFiller,
+    pre: Alloc,
+    fork: Fork,
+    opcode: Opcode,
+    empty_topic: bool,
+    size: int,
+    fixed_offset: bool,
+):
+    """Test running a block with as many LOG opcodes as possible."""
+    env = Environment()
+    max_code_size = fork.max_code_size()
+
+    calldata = Op.PUSH0 if empty_topic else Op.PUSH32(2**256 - 1)
+
+    topic_count = len(opcode.kwargs or []) - 2
+
+    offset = Op.PUSH0 if fixed_offset else Op.MOD(Op.GAS, 7)
+
+    code_sequence = Op.DUP1 * topic_count + Op.PUSH32(size) + offset + opcode
+
+    code = code_loop_precompile_call(calldata, code_sequence, fork)
+    assert len(code) <= max_code_size
+
+    code_address = pre.deploy_contract(code=code)
+
+    tx = Transaction(
+        to=code_address,
+        gas_limit=env.gas_limit,
+        sender=pre.fund_eoa(),
+    )
+
+    state_test(
+        env=env,
+        pre=pre,
+        post={},
+        tx=tx,
+    )