CodePipeline with CodeDeploy using Lambda NodeJS does not receive Github Source

I have a react git repo on github.

I've created a pipeline, sourced from Github. When I pipe it directly to an S3 deploy, everything works fine.

When I add a build stage, based on a lambda/NodeJS image, it cannot find the input source files from github. I am doing more research but after the build failed due to:

DOWNLOAD_SOURCE	| Failed | INFO: YAML file does not exist

I created my own buildspec as part of the code build. I just put in a "ls -R ../.." and I got back unexpected output as shown below.

[Container] 2023/11/20 16:08:11.003334 YAML location is /tmp/codebuild/readonly/buildspec.yml
[Container] 2023/11/20 16:08:11.003657 Processing environment variables
[Container] 2023/11/20 16:08:11.018688 Moving to directory /tmp/codebuild/output/src2799/src/s3/01
[Container] 2023/11/20 16:08:11.180017 Running command ls -R ..
..:
01
03

../01:
rao0cYd

../03:
executor
start_cb_mce_entrypoint.sh

I did a separate run and got:

[Container] 2023/11/20 15:45:02.693251 Running command ls -la
total 500
drwxr-xr-x 2 sbx_user1051 990   4096 Nov 20 15:45 .
drwxr-xr-x 4 sbx_user1051 990   4096 Nov 20 15:45 ..
-rw-rw-r-- 1 sbx_user1051 990 501037 Nov 20 15:45 O7jpRjO

When I switch to CodeBuild using an EC2 instance it sort of works. Is the Lambda version of CodeBuild broken?