AWS SRE Agent - Investigation stay open and Stall

Good morning all.  

We just got the AWS SRE Agent running at my customer site   When do the investigations close?  We had a couple running.... the problem in DT closed, but the investigation was still ongoing after an hour.   The investigation in AWS finished within a few minutes... but DT still says it is open...  UPDATE: the investigation did STALL but after a very long time.

Below is the tenant/environment this occurred on:
[can be provided privately]

Thanks,
Nate.

No source files, tests, or entry points are identified in the issue. Start by reproducing the stalled investigation with the tenant and environment details provided privately, then compare when AWS and Dynatrace report completion; done means the investigation closes reliably or the stall is diagnosed and documented.

Written by the indexing model from the issue text.