Some issues do not have any available workflow actions. The issues which are missing the available workflow actions do not have any condition. Even if they do, the condition is being met.
This error is likely to be caused by a mismatch between the workflow step and the workflow itself.
If you are not a JIRA administrator or cannot run the integrity checker (see solution below), you can move the issue to another project (that has a different workflow), and then move it back to original project. The workflow actions should be available again.
Clone the problematic ticket and the cloned ticket will shown the workflow actions again.
Copy the current Workflow Scheme, and re-assign the copied scheme to the affected project