#18660 Third-party library missing from `mpy` sandbox when using `[pex].venv_use_symlinks = true` Issue created by danxmoran Describe the bug In a minimized(-ish) example: `pants.toml`:

[GLOBAL]
pants_version = "2.16.0rc0"
backend_packages = [
    "pants.backend.python",
    "pants.backend.python.typecheck.mypy",
]

[source]
root_patterns = ["/"]

[python]
interpreter_constraints = ["==3.8.*"]
enable_resolves = true
default_resolve = "default"

[python.resolves]
default = "default.lockfile"

`requirements.txt`:

opentelemetry-exporter-otlp-proto-http==1.15.0
opentelemetry-instrumentation-grpc==0.36b0
opentelemetry-sdk==1.15.0

`default.lockfile`: ``` // This lockfile was autogenerated by Pants. To regenerate, run: // // pants generate-lockfiles --resolve=default // // --- BEGIN PANTS LOCKFILE METADATA: DO NOT EDIT OR REMOVE --- // { // "version": 3, // "valid_for_interpreter_constraints": [ // "CPython==3.8.*" // ], // "generated_with_requirements": [ // "opentelemetry-exporter-otlp-proto-http==1.15.0", // "opentelemetry-instrumentation-grpc==0.36b0", // "opentelemetry-sdk==1.15.0" // ], // "manylinux": "manylinux2014", // "requirement_constraints": [], // "only_binary": [], // "no_binary": [] // } // --- END PANTS LOCKFILE METADATA --- { "allow_builds": true, "allow_prereleases": false, "allow_wheels": true, "build_isolation": true, "constraints": [], "locked_resolves": [ { "locked_requirements": [ { "artifacts": [ { "algorithm": "sha256", "hash": "63579f9a0628e06278f7e47b7d7d5b6ce20dc65c5e96a6f3ca99a6adca0396e8", "url": "https://files.pythonhosted.org/packages/df/73/b6e24bd22e6720ca8ee9a85a0c4a2971af8497d8f3193fa05390cbd46e09/backoff-2.2.1-py3-none-any.whl" }, { "algorithm": "sha256", "hash": "03f829f5bb1923180821643f8753b0502c3b682293992485b0eef2807afa5cba", "url": "https://files.pythonhosted.org/packages/47/d7/5bbeb12c44d7c4f2fb5b56abce497eb5ed9f34d85701de869acedd602619/backoff-2.2.1.tar.gz" } ], "project_name": "backoff", "requires_dists": [], "requires_python": "<4.0,>=3.7", "version": "2.2.1" }, { "artifacts": [ { "algorithm": "sha256", "hash": "4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18", "url": "https://files.pythonhosted.org/packages/71/4c/3db2b8021bd6f2f0ceb0e088d6b2d49147671f25832fb17970e9b583d742/certifi-2022.12.7-py3-none-any.whl" }, { "algorithm": "sha256", "hash": "35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3", "url": "https://files.pythonhosted.org/packages/37/f7/2b1b0ec44fdc30a3d31dfebe52226be9ddc40cd6c0f34ffc8923ba423b69/certifi-2022.12.7.tar.gz" } ], "project_name": "certifi", "requires_dists": [], "requires_python": ">=3.6", "version": "2022.12.7" }, { "artifacts": [ { "algorithm": 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