Bug InvalidOperationException: Failed to Free handle with Index=0 Version=0 at UnityEngine.UIElements.

Hi,

I'm on WebGL and using Addressables to load uxml files.
I'm loading and instatiating one element 6 times and the first time I get the following error, but the other 5 times it works fine:

Code (CSharp):

1. InvalidOperationException: Failed to Free handle with Index=0 Version=0
2.   at UnityEngine.UIElements.Layout.LayoutDataStore.Free (UnityEngine.UIElements.Layout.LayoutHandle& handle) [0x00000] in <00000000000000000000000000000000>:0

What's interesting is that it was working fine before and I've been reverting back and forth the changes when this started happing, but there's no pattern.

I was close to identify the issue, but without any luck:
Maybe it was using Addressable Asset Settings - Catalog - Player Version Override (I switched back and fourth, it was fixed at some point, but the issue came back)
Maybe because intially the VisualElement - display is none (so hidden) and mayb the Layout issue, thought it doesn't seem to be, since the other elements work fine.

 

Started having the same issue.

Still can't identify it. Do you mind sharing if you managed to resolve it?
I can't reproduce in Unity 2022.x LTS. Can easily reproduce in 2023.1.x and 2023.2.x.

Will share a bug report if there's no follow up later this week.

 

I have the same issue but I don't really need a webgl build right now so I didn't investigate much and I didn't submit a bug report.
EDIT: I don't use Addressables to load uxml files, I use Resources.Load (not sure if it's different)

 

Bug report here: https://forum.unity.com/threads/202...nager-destroynode-when-changing-uxml.1465181/

It's weird, I don't get the error often but it appears randomly while I was investigating the issue linked above.