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Gaps Between First-Generation and Second-Generation Managed Packaging

The following functionality is supported in first-generation managed packaging, and not yet supported in second-generation managed packaging. We’re working to address these feature gaps.

Components can’t be deleted from packages.
Package versions can’t be deprecated.
Apex VersionProvider isn’t supported.
A default language for labels in packages can’t be specified.
Apex exception errors don’t trigger email notifications.
Notifications for packaging errors aren’t sent.

See the Metadata Coverage Report, for the latest information on supported metadata types.