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Changing SkeletonUtilityBone mode in Unity runtime not working in latest beta

abuki

Hi,

I discovered that when I run a game with SkeletonUtilityBone set with mode to SkeletonUtilityBone.Mode.Follow and then in play mode I change to SkeletonUtilityBone.Mode.Override (via inspector or via API) the override does not start working. If the override is present from the start before entering play mode, it works fine.

I can see the same problem in several places in the game, so I think this will be a general bug. Can you see it, or should I specify it more?

Misaki

abuki From what I’ve tested using an example scene, it appeared to work fine when I changed the mode to “Override” in the Inspector while the scene was running:

The version of the spine-unity package I tried is spine-unity-4.3-2026-03-18-beta.

To help us reproduce the issue, please send us a minimal Unity project via email: contact@esotericsoftware.com
Please include the URL of this forum thread in the email so we know the context. Then we can take a look at what's wrong.

abuki

I have the latest Unity runtime spine-unity-4.3-2026-03-18-beta
I can confirm that the example with eyes is working normally on my side too. So I think it will be something specific to my skeleton? I am sending the problematic skeleton here:

plank.zip

286kB

Here is a video where you can clearly see that the override is only working when set before entering playmode. Are we doing something wrong with the skeleton? Again, I remind you that it was working fine with non-beta runtime.
To reproduce, I simply spawn the follow hierarchy from SkeletonUtility, and the rest is seen in the video.

Misaki

abuki Thank you for providing the Spine project file that reproduces the issue.
I have confirmed that the issue can be reproduced when using your project file. @Harald will be back next week and will likely investigate the cause, so please wait for a more detailed response.

Although this is not directly related to the issue, please note that your skeleton uses a bone hierarchy that is not recommended when using Chain Scale, as indicated by the warning symbol shown on the path constraint. When using Chain Scale, the target bones are expected to share the same parent. This is explained in the following section of the user guide: https://esotericsoftware.com/spine-path-constraints#Rotate-Mix

abuki

Oh, update - looks like if I delete all other SkeletonUtilityBone objects and keep just the Front_Center_Handle it starts working normally (override can be set after entering playmode). But why?

abuki

Great, thanks! I am meanwhile rewriting all the overrides to use direct Bone api and do not use SkeletonUtility at all, because I hope for some small performance gain. Still I thought it might be good for you to investigate.

Harald

@abuki Thanks for reporting and sorry for the troubles! We've fixed the issue on the 4.3-beta branch.

A new spine-unity 4.3-beta unitypackage is available for download:
https://esotericsoftware.com/spine-unity-download

Issue ticket URL for later reference:
EsotericSoftware/spine-runtimes3051

abuki

Hi Harald, I can confirm the fix, thanks!

Harald

Thanks for confirming!