Annotation dumps failing on mask, even using example code

[dmurphree]

Hello,

Using the example code get_annotations.py I am seeing repeatable dump failures for about 50% of the annotations in a current project, while the others dump just fine.

The errors seem to always be on the masks (the crops download fine), and are either:
500 Internal Server Error
502 Bad Gateway

Here is an example:

#crop downloads successfully:
[2022-10-11 08:48:42,065][INFO] File downloaded successfully from http://redacted.computer.name/api/userannotation/1539856/crop.jpg with parameters {'maxSize': 512, 'bits': 8, 'complete': True}

#mask fails with Bad Gateway:
[2022-10-11 08:48:42,087][INFO] [GET] http://redacted.computer.name/api/userannotation/1539856/mask.jpg | 502 Bad Gateway
Traceback (most recent call last):
File "redacted/get_annotations.py", line 139, in
annotation.dump(dest_pattern=os.path.join(params.download_path, "{project}", "mask", "{id}.jpg"), mask=True, max_size=512)
File "redacted/cytomine/models/annotation.py", line 133, in dump
files = generic_image_dump(dest_pattern, self, dump_url_fn, override=override, **parameters)
File "redacted/cytomine/models/_utilities/dump.py", line 62, in generic_image_dump
raise DumpError("Could not dump the image.")
cytomine.models._utilities.dump.DumpError: Could not dump the image.

I am using Cytomine 3.0.0 , Python 3.9.7

Any thoughts on what might be wrong? Crops download fine for all annotations, even the half that the masks fail on.

Thanks!

Dennis