Child Actors Do Not Retain Correct Position After Culling in 36.00 Update

Summary

As of the latest 36.00 update, child actors that are attached to a parent actor do not correctly inherit the parent’s world position after being culled and then reloaded into view. When the camera moves back within render distance, the child actor reappears in an incorrect location—often reverting to its relative transform without accounting for the parent’s world transform changes that occurred during the culled state.

Code snippet used to handle the movement sequence of the parent and children attached below as an image upload.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

  1. Create parent → child hierarchy in outliner
  2. Move parent object via verse or sequencer
  3. move player/camera away far enough to cause parents/children to be culled
  4. Move player/camera back towards objects to render them again
  5. The child actor(s) is now out of sync with the parent’s current position., and there are “ghost” collisions where the actors should be…

Expected Result

Child actors should reappear in the correct relative position, accounting for any changes to the parent’s world transform while culled.

Observed Result

Child actors return with incorrect positioning, as if frozen at their last known transform or reset to a default.

Platform(s)

All

Upload an image

Video

Additional Notes

This issue breaks visual fidelity and gameplay logic for setups using dynamic parent-child actor relationships, especially in large or open-world environments.

+1 Vote,

Yeah that looks nasty, the new LUR needs a bit of attention for attachments.
I’m noticing it with lights, rotating/negative scaling a light fixture, it’s attached light component does not follow the parent correctly

This is a big issue for us. Our latest tycoon makes heavy use of nested children for various elements when building a character. Additionally elements we teleport on / off when purchased are having issues.

We’ll get someone to take a look.

2 Likes

Thanks for all of the info here, folks. We have a repro here and the team will start working on it.

3 Likes

Thank you!

FORT-925320 has been added to our ‘To Do’ list. Someone’s been assigned this task.