🐛 Fix
PLEN-11324: In issue-based subscriptions with multiple steps, the first step could end too early even though not all entitled issues had been delivered. This caused missing or even future issues to be billed in the next step. Steps now only close once the correct number of deliveries is reached, and billing in the following step no longer overlaps.
PLEN-11317: When importing multi-step subscriptions via the API, the import could fail in certain cases regardless of the reference start date provided. Validation now reliably accepts valid values again, so the import succeeds when a correctly aligned reference start date is used.