Exporting and importing a repository converts Tasks to Comments

Issue Summary

This is reproducible on Data Center: (yes)

Steps to Reproduce

1. Create a repository with a Pull Request and add at least one Task to the Pull Request.
2. Export the repository, then import it (not necessarily to a different instance of Bitbucket DC).
3. Navigate into the imported repository, open the Pull Request and find your Task.

Expected Results

• The Task should be migrated as a Task

Actual Results

• The Task is migrated as a Comment

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available