yuanjiashun version 4.1.15 , GitHub:https://github.com/DarkYuanJs/SpineTest1.git
bug: 使用分层渲染时，桌子没有按照渲染层级来进行分层渲染，腿部和手腕有穿帮问题

Unfortunately we could not reproduce any issue with the git project you provided. Each part GameObject with a SkeletonPartsRenderer is rendering in the order of the SkeletonPartsRenderer Order in Layer property, as described here as well:
https://zh.esotericsoftware.com/spine-unity#SkeletonRenderSeparator

Please note that the separator slots are separating your mesh in the draw order, not according to the bone hierarchy. Did you perhaps expect different separation?

In general, please always be sure to test with the latest version of the spine-unity runtime when encountering any issues.

如果插槽数量过多的情况下如何把某个SpriteRenderer插入到中间，有啥好办法吗？

You can insert a SpriteRenderer in the middle of a skeleton by setting the Order in Layer at each SkeletonPartsRenderer and at your middle SpriteRenderer accordingly.

@yuanjiashun Yes, exactly like that.

After it is separated, you just need to ensure that the Order in Layer is setup accordingly so that it's rendered in the desired order and appears in the middle. For example using Order in Layer values of 0, 5 and 10 it would be:

• Skeleton
  • Part0: Order in Layer = 0
  • Part1: Order in Layer = 10
• Inserted Middle GameObject: Order in Layer = 5

Note that the order in the Hierarchy window tree does not matter for MeshRenderer.

@yuanjiashun Yes, exactly like that.