Attaching to Spawnable actors in Sequencer in a Multi-User session Not working as expected

Over the past several months we’ve been having a lot of ICVFX projects that are centered around playback with sequencer, and specifically with sometimes complex sequences that involve spawnable tracks that we attach to, and with the expectation that we need to make on-the-day stage side adjustments inside a multi user session to these sequences.

We’ve encountered various operational issues where basically, things are not transacting correctly, or won’t transact unless we close down the sequence, save the asset/level, and then reopen the sequence - or in the worse case, requiring a persist and restart of the nDisplay cluster.

These operational issues fundamentally meant on some shoots, we could not make any sequencer changes at all unless we either “went down and up” or had a chance to re-save and reload the content, or ultimately resorting to doing all work on a machine outside the session beforehand and pulled them in on a next relaunch.

This problem does seem to be specifically related to attaching to spawnable actors, because the behavior is not seen with regular possessable bindings.

*This happens multiple times a day.

Workaround is to close the sequence, save the asset/level, and then reopen the sequence - or in the worse case, requiring a persist and restart of the nDisplay cluster.

Steps to Reproduce
1. Create a sequence that has a spawnable actor (like a cinecamera) that animates

2. Add another actor, like the nDisplay, and add an attach track to attach to the spawnable actor

3. Now add a transform track to the Ndisplay to try and offset the ndisplay

4. If you make a keyframe to offset it, it works as expected in editor, does not transact to the cluster

5. To fix it, close the sequencer and save the sequence and then reopen it.

Hi Terra, Thank you for the repro steps here. I am taking a look, and will get back with you as soon as I can.

Best,

Michael

Hi Terra.

We can reproduce the issue on our side in both UE 5.6 and (pre-release) UE 5.7 so it’s definitely still happening. We logged a dev ticket and will hopefully be able to get it into either a 5.7 patch or at least 5.8. We’ll keep you posted.

Ryan.

Thank you for the update!

Terra

Would it be possible to get a link to the bug tracker or ticket for this issue?

Hi Terra, sorry but our Dev Jira tickets are internal only. I will keep you guys posted.