I updated to the latest version of export script from Github.
The draw order list is totally upside down after import to spine.
There is nothing special about the psd except I have a [folder] tag enclosing the whole character.
Other layers are just having simple merge and ignore occasionally.
Adobe Photoshop Version: 20.0.5 20190605.r.83 2019/06/05: 1206907 x64
Operating System: Windows 10 64-bit
Ok... I found something.
If I import to new skeleton, things will be fine. The problem only occurs when importing to existing skeleton.