Workflow transitions are missing from an issue view if the issue's workflow state is invalid

Summary

If the value of an issue's workflow state does not exist in the active workflow in use no transition buttons will be present on the issue view

Steps to Reproduce

Currently we haven't determined a reliable reproduction method but we suspect the following can cause this:

1. Mis-configured CSV imports
2. Mis-configured email creation handlers
3. Workflow migrations

Expected Results

Either this never occurs or JIRA is able to handle this condition gracefully such as an option to move the issue into a valid state

Actual Results

Workflow transitions are missing when viewing the issue

Notes

This is not a new problem and has existed in JIRA for a very long time

Workaround

Fromw Workflow transition button disappeared from the issue view page:

Workflow inconsistency : Please move the issue to other issue type then move it back to force JIRA to trigger a workflow remap.