Computed field can compute children field, even if its type isn't computed
How to reproduce:
Have a hierarchy between user stories and tasks
User story has a computed field `remaining_effort`. Task has an integer field `remaining_effort`
- create a user story US1
- create a task T1 without fill any remaining effor
- create a task T2 with a remaining effort of 13
- manually add a link from US1 -> T1 (child)
- manually add a link from T1 -> T2
Go in US1
- Remaining effort is shown with a value of 13
Go in T1
- Remaning effort is shown with an Empty value
=> US1 remaining effort is incorrect, as T1 do not have value, its effort must be Empty