Droplet must be in staged state

[mdcarlson]

I am kicking the tires on cfrevisions-plugin in a lab environment and getting an error when I attempt to rollback to a prior version. Here's what I tried:

1. Enabled revisions with cf enable-revisions <appname>
2. Pushed the app
3. Made a change to the app and rebuilt
4. Pushed the app again
5. Listed revisions with cf revisions <appname> successfully
6. Attempted cf rollback <appname> <version-number>

cf rollback hello-java11 2
Rolling back app hello-java11 to version 2...

Failed to initiate rollback: droplet must be in staged state

What do I need to do to ensure the droplet is in the staged state?

When I run cf v3-droplets <appname> I see that the prior version (v1) has a state of expired even though it that version is a few minutes old. Should I be using the cf v3-push by chance?