Overview:
Documents are not updated to the next major version in a Vault Bulk Document State Change.
Root Cause:
Check the entry actions that are set on the bulk action.
Solution:
A bulk action follows the entry actions for that state. The entry action: Set new major version needs to be configured for this to work in a bulk action. It is needed for an individual document state change.
Navigate to: Admin --> Configuration --> Document Lifecycles --> [Lifecycle] --> States --> [State] --> Entry Actions.

Related Documentation:
Vault Help Documentation: Defining Document State Entry Actions
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