Having a strange problem building a distribution for a Lambda function where the function is dying because the PEX doesn't have required dependencies. Here's my `BUILD`:

docker_image(
    name="create_json_image",
    repository="repo",
    dependencies=[":create_json_lambda"],
    image_tags=["tag"],
)

python_awslambda(
    name="create_json_lambda",
    runtime="python3.8",
    handler="lambda_function.py:lambda_handler",
)

python_sources(
    dependencies=[
        "src/vendor/python:reqs#pkg1",
        "src/vendor/python:reqs#pkg2",
    ]
)

And then the Lambda itself gives me errors like:

[ERROR] ResolveError: Failed to resolve requirements from PEX environment @ /app.
Needed cp38-cp38-manylinux_2_26_x86_64 compatible dependencies for:
1: Pillow>=8.1.1
Required by:
pkg2
But this pex had no ProjectName(raw='Pillow', normalized='pillow') distributions.

(with lots of other un-available packages). Is this a problem with Lambdex? Pants has always been so great at avoiding dependency errors!

The selection of wheels will be best if you use a complete platform JSON file for the environment you’re deploying to, instead of the

runtime

that just estimates what will be compatible, and may choose wheels that are too new/incompatible. Once you use a JSON file, you may also need to tell pants about the latest version of the PEX tool, as it contains some relevant bug fixes. Here’s a thread from a few days ago that discusses these: https://pantsbuild.slack.com/archives/C046T6T9U/p1673153412271249 (Note: that’s for 3.9, not 3.8, so the files there won’t be directly applicable)