It seems the root of the problem is the spine version. Is 3.8.99 supported? I noticed that the atlas file has different properties than the reference one.
The version of the Spine runtime I implemented was 3.8, and there was no mention of any minor version after that, so I think it was pure 3.8.
I don't know what minor version the problematic, modified file structure version is from.
We hope to eventually update to the current version.
