The file cache in package_dependencies.jsonl is keyed on (name, version, python_version) only; if deps constraints for an integration change in TEST_SUITE_CONFIG, a subsequent run will return the previously-cached (now incorrect) resolved dependencies without re-running the pip dry-run, silently producing wrong transitive dependency pins.

When _render_transitive_dependencies raises DryRunFailed for a particular (release, python_version), the loop continues without appending to release.transitive_dependencies, but the release stays in test_releases and gets rendered into tox.ini with pins from whichever Python versions succeeded. The failure is only surfaced via a print() during generation, so the generated tox.ini carries no marker that pinning is partially missing for one Python version. Since this is a developer-run CI tooling script with visible stdout output (not runtime/production code), severity is low — consider either failing the run, or emitting a comment into the generated env so the gap is auditable after the fact.