diff --git a/contracts/scripts/ci/find_slither_report_diff.sh b/contracts/scripts/ci/find_slither_report_diff.sh
index 4985b8ddeff..6a558afdbda 100755
--- a/contracts/scripts/ci/find_slither_report_diff.sh
+++ b/contracts/scripts/ci/find_slither_report_diff.sh
@@ -47,7 +47,7 @@ openai_result=$(echo '{
 # throw error openai_result when is not 200
 if [ "$openai_result" != '200' ]; then
   echo "::error::OpenAI API call failed with status $openai_result: $(cat prompt_response.json)"
-  return 1
+  exit 1
 fi
 
 # replace lines starting with ' -' (1space) with '  -' (2spaces)
@@ -80,7 +80,7 @@ if [[ -n "$validation_prompt_path" ]]; then
   # throw error openai_result when is not 200
   if [ "$validation_result" != '200' ]; then
     echo "::error::OpenAI API call failed with status $validation_result: $(cat prompt_validation_response.json)"
-    return 1
+    exit 1
   fi
 
   # replace lines starting with ' -' (1space) with '  -' (2spaces)
diff --git a/contracts/src/v0.8/functions/v1_3_0/FunctionsBilling.sol b/contracts/src/v0.8/functions/v1_3_0/FunctionsBilling.sol
index 49ecf3d6652..98a28c3bf35 100644
--- a/contracts/src/v0.8/functions/v1_3_0/FunctionsBilling.sol
+++ b/contracts/src/v0.8/functions/v1_3_0/FunctionsBilling.sol
@@ -91,6 +91,18 @@ abstract contract FunctionsBilling is Routable, IFunctionsBilling {
     return s_config;
   }
 
+  fallback() external {
+    // copied directly from OZ's Proxy contract
+    assembly {
+    // Copy msg.data. We take full control of memory in this inline assembly
+    // block because it will not return to Solidity code. We overwrite the
+    // Solidity scratch pad at memory position 0.
+      calldatacopy(0, 0, calldatasize())
+
+      return(0, returndatasize())
+    }
+  }
+
   /// @notice Sets the Chainlink Coordinator's billing configuration
   /// @param config - See the contents of the FunctionsBillingConfig struct in IFunctionsBilling.sol for more information
   function updateConfig(FunctionsBillingConfig memory config) public {