When you import new releases via CSV, you cannot specify a release template to be applied to the release.
The side effect of this, is that all imported releases have no release phases.
We should allow people to specify a release template by name when importing releases to avoid all this hassle.
Or if that is too complicated, maybe we can just apply the default release template instead?
Thanks for the idea!
We will continue to monitor this idea for community feedback and overall prioritization.
In the interim, you can set a release template after a release has been created. From the release's [...] menu, select "Apply new release phase template", and then select the template you would like to apply to that release.