FattyJoker In my previous reply, I mentioned that no artifacts appeared when exporting and importing only the relevant skeleton. This is effectively the same result as when the "Atlas per skeleton" option is selected. However, based on your earlier message, I understand that your goal is to combine the textures of multiple skeletons into a single atlas, so using "Atlas per skeleton" may not be the desired solution in your case.
The difference between "Single atlas" and "Atlas per skeleton" is described in the user guide: https://esotericsoftware.com/spine-texture-packer#Packing-during-data-export
If multiple skeletons are expected to appear in the same scene, combining their textures into a single atlas can reduce the number of materials and thus reduce draw calls. On the other hand, if the skeletons are unlikely to appear together, it's better to pack them separately to avoid loading unnecessarily large textures, which can affect performance.
We are continuing to investigate the root cause of the artifact, so please bear with us while we look into it.
