I have a task, which is linked to an epic, but in the Advanced Roadmap overview, it says it has no parent. How is this possible and how can it be solved?
Overview in Roadmap:

Details in the task:
We're using version 3.28.0
EDIT:
In addition to this question, I also notice that the Epic label isn't shown in the Active Sprint-screen, but when editing that item, you see that it has an epic linked
When you add an estimation or remove a comment of the ticket, the label is shown. I think it has something to do with caching.