diff --git a/test/src/concrete/Flow.construction.t.sol b/test/src/concrete/Flow.construction.t.sol
index 03206941..6d1edb94 100644
--- a/test/src/concrete/Flow.construction.t.sol
+++ b/test/src/concrete/Flow.construction.t.sol
@@ -7,6 +7,8 @@ import {Vm} from "forge-std/Test.sol";
 import {EvaluableConfigV3} from "rain.interpreter.interface/interface/IInterpreterCallerV2.sol";
 import {FlowTest} from "test/abstract/FlowTest.sol";
 import {EmptyFlowConfig} from "src/error/ErrFlow.sol";
+import {ICloneableV2} from "rain.factory/src/interface/ICloneableV2.sol";
+import {Flow} from "src/concrete/Flow.sol";
 
 contract FlowConstructionTest is FlowTest {
     function testFlowConstructionEmptyConfigReverts() external {
@@ -16,6 +18,74 @@ contract FlowConstructionTest is FlowTest {
         I_CLONE_FACTORY.clone(impl, abi.encode(emptyConfig));
     }
 
+    /// The typed `initialize(EvaluableConfigV3[])` overload is mandated by
+    /// `ICloneableV2` to revert with `InitializeSignatureFn` so that it is
+    /// NEVER accidentally called in place of the canonical `initialize(bytes)`.
+    /// forge-config: default.fuzz.runs = 100
+    function testFlowImplementationInitializeStructOverloadAlwaysReverts(EvaluableConfigV3[] memory evaluableConfigs)
+        external
+    {
+        Flow impl = Flow(deployFlowImplementation());
+        vm.expectRevert(ICloneableV2.InitializeSignatureFn.selector);
+        impl.initialize(evaluableConfigs);
+    }
+
+    /// The typed overload must revert even on an already-initialized clone.
+    /// forge-config: default.fuzz.runs = 100
+    function testFlowCloneInitializeStructOverloadAlwaysReverts(
+        address expression,
+        bytes memory bytecode,
+        uint256[] memory constants,
+        EvaluableConfigV3[] memory secondCallConfigs
+    ) external {
+        expressionDeployerDeployExpression2MockCall(expression, bytes(hex"0007"));
+
+        EvaluableConfigV3[] memory flowConfig = new EvaluableConfigV3[](1);
+        flowConfig[0] = EvaluableConfigV3(DEPLOYER, bytecode, constants);
+
+        address clone = I_CLONE_FACTORY.clone(deployFlowImplementation(), abi.encode(flowConfig));
+
+        vm.expectRevert(ICloneableV2.InitializeSignatureFn.selector);
+        Flow(clone).initialize(secondCallConfigs);
+    }
+
+    /// `_disableInitializers` in the implementation constructor must block
+    /// any direct `initialize(bytes)` call on the implementation.
+    /// forge-config: default.fuzz.runs = 100
+    function testFlowImplementationInitializeBytesAlwaysReverts(
+        address expression,
+        bytes memory bytecode,
+        uint256[] memory constants
+    ) external {
+        expressionDeployerDeployExpression2MockCall(expression, bytes(hex"0007"));
+
+        EvaluableConfigV3[] memory flowConfig = new EvaluableConfigV3[](1);
+        flowConfig[0] = EvaluableConfigV3(DEPLOYER, bytecode, constants);
+
+        Flow impl = Flow(deployFlowImplementation());
+        vm.expectRevert(bytes("Initializable: contract is already initialized"));
+        impl.initialize(abi.encode(flowConfig));
+    }
+
+    /// A successfully initialized clone must reject a second
+    /// `initialize(bytes)` call.
+    /// forge-config: default.fuzz.runs = 100
+    function testFlowCloneInitializeBytesOnceOnly(
+        address expression,
+        bytes memory bytecode,
+        uint256[] memory constants
+    ) external {
+        expressionDeployerDeployExpression2MockCall(expression, bytes(hex"0007"));
+
+        EvaluableConfigV3[] memory flowConfig = new EvaluableConfigV3[](1);
+        flowConfig[0] = EvaluableConfigV3(DEPLOYER, bytecode, constants);
+
+        address clone = I_CLONE_FACTORY.clone(deployFlowImplementation(), abi.encode(flowConfig));
+
+        vm.expectRevert(bytes("Initializable: contract is already initialized"));
+        Flow(clone).initialize(abi.encode(flowConfig));
+    }
+
     function testFlowConstructionInitialize(address expression, bytes memory bytecode, uint256[] memory constants)
         external
     {