System Information
Operating system: Win 10
Graphics card: GTX 1080ti

Blender Version
Broken: 2.80, release candidate 2
Worked:

Short description of error
If you enable Asset pass first, then Object, one object pass will be isolated by itself.

Exact steps for others to reproduce the error

1. Go to Compositor
2. Check Use Nodes
3. In the Properties editor choose the Cycles engine
4. Go to render pass settings
5. Under Cryptomatte, check Asset first THEN Object
6. See this in the composer:
   

All object passes are supposed to be grouped at the top.
(Same thing happens with Material pass if you choose that instead of Object.)

Oddly, if you check Object pass first THEN Asset, they will appear in the correct order.