id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1336946890,I_kwDOAMm_X85PsDDK,6909,Loading icon-d2,21034385,closed,0,,,3,2022-08-12T09:04:46Z,2022-08-17T19:25:51Z,2022-08-17T19:25:51Z,NONE,,,,"### What is your issue?

Hej Everybody (Hi Julius :) ),
we are using the DWD Icon models a lot, but I currently have the issue loading files with `'generalVerticalLayer'`, which is their description for a vertical axis.
It seems to me, that xarray is not recognizing it as a coordinate.


cfgrib                    0.9.8.5 
xarray                    0.19.0


```python
import xarray as xr

file_list = ['icon-d2_germany_regular-lat-lon_model-level_2022052303_000_59_u.grib2',
        'icon-d2_germany_regular-lat-lon_model-level_2022052303_000_64_u.grib2']

ds = xr.open_dataset(file_list, engine='cfgrib')
```




```python-traceback
ValueError: Could not find any dimension coordinates to use to order the datasets for concatenation
```

Find the data attached:
[icon-d2_germany_regular-lat-lon_model-level_2022052303_000_u.zip](https://github.com/pydata/xarray/files/9315066/icon-d2_germany_regular-lat-lon_model-level_2022052303_000_u.zip)
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