html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/pull/3915#issuecomment-609401377,https://api.github.com/repos/pydata/xarray/issues/3915,609401377,MDEyOklzc3VlQ29tbWVudDYwOTQwMTM3Nw==,10194086,2020-04-05T11:27:22Z,2020-04-05T11:27:22Z,MEMBER,"The MWE in  #3569 throws an error after #3916 (`ValueError(""Cannot supply vmin and a norm with a different vmin."")`) - maybe it is enough to test that it works again?

I reverted to before #3569 and tried to figure out the difference in the `QuadContourSet` in terms of norm and some other properties of `h` and `facet._mappables[0]` is and couldn't figure it out.

```python
h = ds[0].plot.contour(levels=[4], colors=['k'])
facet = ds.plot.contour(col='time', levels=[4], colors=['k'])

```

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