Tasks.org subtask syncing issue

When a list from Tasks.org is synced with Vikunja, the relationship between the parent and child is not preserved. I have to manually click on each subtask and then select the relationship to the parent tasks. And then the tasks are still displayed at the same nesting level as the parent tasks, which at least to me is less visually clear.

What is the expected behaviour for Vikunja when importing nested task lists from Tasks.org? Is the parent/child relationship not being preserved a bug?

This sounds like a bug.