when a project task has multiple subtasks(using indent) I want to hide the subtasks by clicking the [-] sign in front of the parent task.

Only the first subtask is hidden under the [+] of the parent task, all others are still visible.

Is this by design? I would expect all subtask to be hidden after clicking collapse?

[-] task 1
task 2
task 3
task 4
task 5

clicking the [-] results in:

[+] task 1
task 3
task 4
task 5


I would expect:

[+] task 1
task 5

Bug or am I missing something?