Is there a difference in how bundles are promoted?
Promoting a bundle works the same as promoting any individual PR. Select the bundle from the open list and click 'Promote', which validates and promotes those features together as a single unit:
Once the bundle is successfully promoted, it opens against the next environment as a single unit. The individual features are not reopened.
Can I change a bundle after it's been promoted?
Once a bundle is promoted, you'll no longer be able to add or remove individual features from the bundle. The expectation is to fix forward any issues/bugs that are discovered in later environments.
You can still abandon the bundle if you need to, which reopens those features individually at the target environment, but you can't recombine a different subset of them at that point since you'd be past the nominated environment.
What if I discover issues in my bundle after I promoted it?
Today, there is not a first-class way of fixing forward on a bundle. We recommend abandoning the bundle, committing more changes to the individual feature(s) that needs fixing and promoting them normally.
Note: We're aware the above approach is not ideal. We're currently working on a way for teams to fix bundles after they have been promoted to downstream environments.