3.8 is very old, we haven't made fixes to it for many years. It could be a bug in 3.8.

Does it work correctly if you don't use animation clean up?

Coco Creator must have a runtime, else Spine skeletons couldn't be displayed at all. If you are using a runtime that came with it, maybe you can replace their runtime with ours, like could be done with cocos2d-x. If not, then it may be a bug in Coco Creator or the runtime it uses.

Please don't post Chinese as an image, it's hard to translate. Here is your text in English, for others:

Today I studied the spine animation of cocos creator. When I change the spine given by the artist, I always cannot change the clothes successfully. 1. When I change the spine given by the artist, I always cannot change the clothes successfully. Later I found out that in fact, the static clothes are The replacement is successful, but once the animation is played, the costume will be changed back to the original one. Solution: Check whether there is an "attachment" keyframe in the animation file. If there is, just delete it. flow)

If you manually change the skeleton, then apply animations, the animations may make changes that override what you originally changed. One solution is the apply animations, then make your change afterward. You'll need to do this every frame.