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/issues/3687#issuecomment-575598339,https://api.github.com/repos/pydata/xarray/issues/3687,575598339,MDEyOklzc3VlQ29tbWVudDU3NTU5ODMzOQ==,10194086,2020-01-17T11:58:33Z,2020-01-17T11:58:33Z,MEMBER,"This happens in matplotlib when you pass an RGBA array. Thus the following should cause the same problem.

``` python
ax = plt.subplot(projection=ccrs.Robinson())
ax.imshow(ds.isel(time=[0, 1, 4, 8]).transpose('lat', 'lon', 'time').values[-1::-1, :, :], transform=ccrs.PlateCarree())
```

I.e. it is an matplotlib or cartopy error. However, xarray always adds an alpha channel internally, see

https://github.com/pydata/xarray/blob/8a650a11d1f859a88cc91b8815c16597203892aa/xarray/plot/plot.py#L901-L903

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