We had a similar bug that we worked around by adding a transition view of "Resolved Issue Screen" to all steps leading to done in the Add Workflow Transition page.
If you also want to fix existing issues, I'd suggest creating a "loopback" workflow transition on the resolved state, and adding a post-function that sets the resolution to "Fixed" or something similar.
You can then bulk transition all your existing issues and the resolution will get populated correctly.
