Issue with getAttachments() function

Hello,

When using RTCClient, only for certain WorkItems, it is unable to fetch the attachments and it ends up with an error like below:

File "C:\1_Work\Tool\pyFile\main.py", line 10, in check_dou_tag
attachments = str(item.getAttachments())
File "C:\1_Work\Tool\pyFile\rtcclient_v2\workitem.py", line 919, in getAttachments
page_size="10"))
File "C:\1_Work\Tool\pyFile\rtcclient_v2\client.py", line 1428, in _get_paged_resources
filter_rule=filter_rule)
File "C:\1_Work\Tool\pyFile\rtcclient_v2\client.py", line 1497, in _handle_resource_entry
entry_archived = entry.get("rtc_cm:archived")
AttributeError: 'str' object has no attribute 'get'

But for many other WorkItems, the same code works.
Could you help here?