issue_comments: 832359943

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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/5077#issuecomment-832359943 https://api.github.com/repos/pydata/xarray/issues/5077 832359943 MDEyOklzc3VlQ29tbWVudDgzMjM1OTk0Mw== 2448579 2021-05-05T01:38:42Z 2021-05-05T01:38:42Z MEMBER

```

      if layer.collection_annotations is None:

E AttributeError: 'dict' object has no attribute 'collection_annotations' ```

This looks like it comes from our HighLevelGraph manipulations here https://github.com/pydata/xarray/blob/f455e00f0228c30423123c089227d7a8fd4a94b5/xarray/core/parallel.py#L529-L546

Maybe @crusaderky or @jrbourbeau can tell us what's going wrong?

 
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