Insight CMDB child object type mappings failing to import sporadically

[Joanne Wilson]

I have an object type: Resource Server, and it has several child object types - such as Agent, SQL.  The Resource Server parent has 10 attributes that are inherited by its child object types.  The Resource Server object type itself is ABSTRACT.

I am imported data into these object types using JSON. I created an import configuration that maps to object type Resource Server and it has child object type mappings for both Agent and SQL.    

I am unable to import consistently. The import will often complete the indicate it saw 0 entries in the external source (screenshot to be attached).  Occasionally, I will disable all but 1 or 2 child object type mappings and the import works as expected.  The json file is uploaded to the server, so it is not that it cannot be read/reached.

Any ideas on what would cause this inconsistent behavior?

Please note: the examples in the documentation are for CSV imports and Selector is used to differentiate child object types.  With JSON, Selector is not available, so I use "Filter data source by IQL".

[Jean-François FORGET]

I just face the same issue on Jira 8.21.1 and Insight 9.1.3.

And I'm unable to find any config pattern that cause this bug....

Did you find anything?