cdk-assets: Ziping and uploading empty S3 folder

[HFR1994]

Describe the bug

I recently created my own CodePipeline with a step to synth the CDK folder and upload whatever need to be uploaded using cdk-assets, here is my synth definition:

iaac_build_project = codebuild.Project(self, "IaaCBuildProject",
                                               environment=codebuild.BuildEnvironment(
                                                   build_image=codebuild.LinuxBuildImage.AMAZON_LINUX_2_5
                                               ),
                                               build_spec=codebuild.BuildSpec.from_object({
                                                   "version": "0.2",
                                                   "phases": {
                                                       "install": {
                                                           "runtime-versions": {
                                                               "nodejs": 18,
                                                               "python": "3.11"
                                                           },
                                                           "commands": [
                                                               "npm install -g aws-cdk",
                                                               "pip install -r requirements.txt"
                                                           ]
                                                       },
                                                       "build": {
                                                           "commands": [
                                                               "npx cdk synth -c TargetStack=$STACK_NAME",
                                                           ]
                                                       }
                                                   },
                                                   "artifacts": {
                                                       "files": "cdk.out/*"
                                                   }
                                               }),
                                               role=code_build_role
                                               )

And this is the step that uses cdk-assets

cdk_deploy_assets = codebuild.Project(self, "CDKDeployAssets",
                                              environment=codebuild.BuildEnvironment(
                                                  build_image=codebuild.LinuxBuildImage.AMAZON_LINUX_2_5
                                              ),
                                              build_spec=codebuild.BuildSpec.from_object({
                                                  "version": "0.2",
                                                  "phases": {
                                                      "install": {
                                                          "runtime-versions": {
                                                              "nodejs": 18,
                                                              "python": "3.11"
                                                          },
                                                          "commands": [
                                                              "npm install -g cdk-assets@latest",
                                                              "tmpfile=/tmp/aws-session-file",
                                                              "aws sts assume-role --role-arn $CDK_ROLE --role-session-name `whoami`-`date +%d%m%y`-session > $tmpfile",
                                                              "export AWS_ACCESS_KEY_ID=`cat $tmpfile|jq -c '.Credentials.AccessKeyId'|tr -d '\"'`",
                                                              "export AWS_SECRET_ACCESS_KEY=`cat $tmpfile |jq -c '.Credentials.SecretAccessKey'|tr -d '\"'`",
                                                              "export AWS_SESSION_TOKEN=`cat $tmpfile|jq -c '.Credentials.SessionToken'|tr -d '\"'`",
                                                          ]
                                                      },
                                                      "build": {
                                                          "commands": [
                                                              "export AWS_PROFILE=assumed-role",
                                                              "cat cdk.out/$STACK_NAME.assets.json | jq 'del(.'$KEY')' > cdk.out/assets.json",
                                                              "cat cdk.out/assets.json",
                                                              "cdk-assets publish -p cdk.out/assets.json"
                                                          ]
                                                      }
                                                  }
                                              }),
                                              role=code_build_role
                                              )

Althought logs show that assets are being publish, whenever I check S3 zip folder are empty. Any ideas? My folder only contain a single index.py file its defined using the following snippet:

lbd_function = lambda_.Function(self, "lbdFunction",
                                       code=lambda_.Code.from_asset("./lambda/path_to_code"),
                                       handler="index.handler",
                                       timeout=Duration.seconds(30),
                                       runtime=lambda_.Runtime.PYTHON_3_11,
                                       memory_size=256,
                                       role=lambda_role,
                                       function_name="lbd_function"
                                       )

Expected Behavior

Uploaded folder are zipped with the index.py file

Current Behavior

Uploaded folder are zipped with no contents

Reproduction Steps

Create a CodePipeline and use the definitions provided up top.

Possible Solution

No response

Additional Information/Context

It's seems this doesn't happen on my local, any ideas?

CDK CLI Version

2.110.0

Framework Version

No response

Node.js Version

18

OS

Amazon Linux 2023

Language

Python

Language Version

Python 3.11

Other information

No response