Sorry if my English not good:
Hello,
When i export Json and run on Web.
Image 1: Some images will transparent/ lost many layers where it appeared. and you can look background end . (Slot blend: Normal)

Image 2: when animation run, i have anim color 1slot-itself (blend: additive) appeared , it run ok !

Please help me this bug.
Video :

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Layer Slot Spine

3.8.99 is very old, we don't do bug fixes for it anymore. Please export with the latest 4.1 and use the matching latest 4.1 version of the spine-ts runtime.