On production version 3.4 of "WF Enhancer for Jira" we use ∑ Time Spent expression on WF condition to show transition only if parent as well as subtasks have time logged.
When updating "WF Enhancer for Jira" to 3.8.1 ∑ Time Spent takes only parent's logged time into consideration.
Now it's possible to see and make transition just after logging time on parent issue. Where subtasks have nothing logged.
Not sure if this is linked to https://tngtech-oss.atlassian.net/projects/JWFE/issues/JWFE-118 but for now we cannot update this addon and we plan to perform Jira upgrade and need to have compatible addons.