I am not a twine maintainer. Fully supporting metadata version 2.4 was not deemed important enough to delay the release. AFAICT the focus of the release is to make twine compatible with the latest release of pkginfo, one of its dependencies, that had previously to be pinned to an earlier release causing some trouble for distribution maintainers having to integrate twine in their distribution. Full support for metadata version 2.4 will likely be in the next release.
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