My version is 3.8.99. Anyway Here is the problem:
As you can see that orange key didn't change no matter what I try to hide the attachment image in the first keyframe. It keep return back to unhide and become orange again.
The bug happen quite frequently. It usually occur after I copy a whole slot along with their old keyframe.
You can check out the test project in the attachment file to see for yourself.
Okay I see the problem,
When I copy a sloth with 9 images inside along with their keyframe, with the new sloth which I delete 8 unnecessary images.
But the Spine didn't delete their key frame along with the deleted images. And those orange key frame exist as the same name as the last attachment image.(like a soul without a body to possess)
I guess the Spine can be improved with this case: when I delete an attachment image, all of its related key frame should be auto removed too.
