State tree transitions failing when parent state has a task

Hi everyone.

I was trying to update to UE 5.8 form 5.7 and now my State trees are broken, which makes UE 5.8 unusable to me.

Since there are no other changes in my whole project, so I can accurately pinpoint it this issue to the Update.

I’m working with a lot of Linked Asset Subtrees and states with tasks that search for some information and finish immediately. The actual Action happens in child states.

However after the update, transitions between child states fail and the rewind debugger says Could not trigger completion transition, jump back to root state.

The transitions are there so I think I stumbled upon the bug linked below. The issue tracker said that this is fixed before 5.8.1 was released, so I tried it again when it got out and when 5.8.2 was released.

Sadly I’m still having this issue and the Issue tracker does not state a target fix (although if I’m not mistaken one day it stated 6.0 but this is no longer the case, which seems odd to me).

Is there a way I can find out if and when this will be merged in a release?

I’m happy to provide further information if required and would be grateful for any help :smile:

https://issues.unrealengine.com/issue/UE-384337