A short description of the bug

[mattmm1]

Describe the bug
HI in our powerBI ingest we're seeing this ocasionally in our logs:

AssertionError
{datahub.ingestion.api.source_helpers:188} Failed to lowercase urns for Mapper.EquableMetadataWorkUnit(id='powerbi-urn:li:dataset:(urn:li:dataPlatform:powerbi,PROD.ent_support_-_powerbi_dashboards_%28will_h%29.axis_live_sites,PROD)-upstreamLineage', metadata=MetadataChangeProposalWrapper(entityType='dataset', changeType='UPSERT', entityUrn='urn:li:dataset:(urn:li:dataPlatform:powerbi,prod.ent_support_-_powerbi_dashboards_%28will_h%29.axis_live_sites,PROD)', entityKeyAspect=None, auditHeader=None, aspectName='upstreamLineage', aspect=UpstreamLineageClass({'upstreams': [UpstreamClass({'auditStamp': AuditStampClass({'time': 0, 'actor': 'urn:li:corpuser:unknown', 'impersonator': None, 'message': None}), 'created': None, 'dataset': 'urn:li:dataset:(urn:li:dataPlatform:snowflake,PROD.operations_analytics.test.willh_axis_site_info,PROD)', 'type': 'TRANSFORMED', 'properties': None})], 'fineGrainedLineages': None}), systemMetadata=None), treat_errors_as_warnings=False, is_primary_source=True):
Traceback (most recent call last):
  File "/home/python/venv/dnap-datahub-ingest-8zpDmlFD-py3.10/lib/python3.10/site-packages/datahub/ingestion/api/source_helpers.py", line 183, in auto_lowercase_urns
    lowercase_dataset_urns(wu.metadata)
  File "/home/python/venv/dnap-datahub-ingest-8zpDmlFD-py3.10/lib/python3.10/site-packages/datahub/utilities/urns/urn_iter.py", line 156, in lowercase_dataset_urns
    transform_urns(model, modify_urn)
  File "/home/python/venv/dnap-datahub-ingest-8zpDmlFD-py3.10/lib/python3.10/site-packages/datahub/utilities/urns/urn_iter.py", line 106, in transform_urns
    _modify_at_path(model, path, new_urn)
  File "/home/python/venv/dnap-datahub-ingest-8zpDmlFD-py3.10/lib/python3.10/site-packages/datahub/utilities/urns/urn_iter.py", line 129, in _modify_at_path
    assert isinstance(model, DictWrapper)

We're running this with :
Python 3.10.13
DATAHUB_VERSION=0.11.0.5

I can see that something about the model isn't ACTUALLY a dathub model (aka DictWrapper) but because there's asserts :( there I can't tell what it SHOULD be handing to _modify_at_path.

Is this something to be concerned about (e.g., not lowercasing might affect lineage or something else). I'm guessing here that the only effect is it isn't lowercasing something it should? OR what's being passed in here isn't relevant for this and the ERROR message should be perhaps a warning?

Happy to add more or contribute - i just can't tell at the moment what SHOULD be being passed there.

[hsheth2]

@mattmm1 I have a PR up that should fix this