I’m not surprised, given that the PyPA recommended upload tools do not handle metadata version 2.4 correctly. I have opened a PR to make twine and thus gh-action-pypi-publish support metadata 2.4. It would be nice if someone could have a look at it Switch to packaging for parsing metadata and support metadata 2.4 by dnicolodi · Pull Request #1180 · pypa/twine · GitHub
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