yugutou Unfortunately, this video alone does not resolve the issue. I see that the version you were using in the second half of your video is 4.2.23, but I don't know how many versions you were using initially. I also don't know how you expect the color of the slots to change.
In order to confirm a reported problem, we need to see a reproduction of it. So please tell us what version you originally used and what slot color animations you had set up in that version.

yugutou Thank you for providing the actual Spine project. I have checked it with 4.1.24 and 4.2.23 but still do not know what the problem is with the slot color. Could you please explain exactly what you think is wrong? If it is difficult to explain in words, please provide a minimal reproduction project of the problem. For example, if you can provide us with a project that shows not the entire skeleton, but some parts of it, with no transformation, just animated slot colors, that will help us clarify what we should be looking at.

Thanks! We understand now and found the problem. It will be fixed in 4.2.24. Thanks for letting us know!