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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