Workflow is getting stuck at the switch activity.
Release or Environment
The choice value is greater than 40 characters and it caused the issue.
The result of the switch activity has a limit of 40 characters. If the result is more than 40 characters it will be truncated. But the conditions in the switch activity would still have entire value of the variable choice (more than 40 characters). So there will be a mismatch in the switch activity result and the variable choice and therefore the workflow engine would assume none of the conditions in the switch activity matches and it would not take any path and therefore the workflow is stuck at the switch activity.