fix: be more strict regarding which bytes are triggered

src/IncentivizedMessageEscrow.sol

@@ -177,8 +177,7 @@ abstract contract IncentivizedMessageEscrow is IIncentivizedMessageEscrow, Bytes
      * @dev This can only be set once. When set, is cannot be changed.
      * This is to protect relayers as this could be used to fail acks.
      * You are not allowed to set a 0 length implementation address.
-     * If you want to disable a specific route, set it 1 length like
-     * hex"00" or hex"3e" or hex"ee" or hex"ff" or hex"01", etc.
+     * If you want to disable a specific route, set implementation to hex"00".
      */
     function setRemoteImplementation(bytes32 destinationIdentifier, bytes calldata implementation) external {
         if (implementationAddressHash[msg.sender][destinationIdentifier] != bytes32(0)) revert ImplementationAddressAlreadySet(
@@ -259,7 +258,7 @@ abstract contract IncentivizedMessageEscrow is IIncentivizedMessageEscrow, Bytes
         // Check that the application has set a destination implementation by checking if the length of the destinationImplementation entry is not 0.
         bytes memory destinationImplementation = implementationAddress[msg.sender][destinationIdentifier];
         if (destinationImplementation.length == 0) revert NoImplementationAddressSet();
-        if (destinationImplementation.length == 1) revert RouteDisabled();
+        if (destinationImplementation.length == 1 && destinationImplementation[0] == 0x00) revert RouteDisabled();
 
         // Check that the deadline is lower than the AMB specification.
         unchecked {