Your calendar feed link is now shown once
The Feed button on Planning and on a project's Schedule tab gives you a link your calendar app can subscribe to. That link is the whole credential — anyone holding it can read your schedule — so STrOp now stores only a fingerprint of it, the way passwords are stored, and never the link itself.
What changes for you: the link appears once, right after you click Generate or Regenerate. Copy it into your calendar then. Open the panel later and it says a feed is active and when it was created, but can't show the link again. Need it back? Regenerate — the old link stops working and the new one appears, once.
Existing subscriptions keep working. Nothing to redo unless you've lost the link.