``osqueryd`` claims shutdown request failed when exiting from SIGINT

I've written a basic osquery table extension using osquery-go. I confirmed that osquery{d,i} can load the extension and query my table as intended. However, when I try to quit osquery with ctrl+C, I see from osquery:

I0729 08:43:05.621091 134004736 extensions.cpp:220] Extension UUID 7951 shutdown request failed

I run osqueryd with:

sudo ./osqueryd --pidfile=osquery.pid --database_path=osquery.db --verbose=true --config_plugin=filesystem --config_path=osquery_test.conf --logger_plugin=filesystem --allow_unsafe --extensions_autoload=extensions.load

Is this expected with the default behavior of Shutdown()? Should I be implementing this signal handling logic myself? I should clarify that the extension process does quit, but I am wondering if the error is avoidable.

Start by tracing Shutdown() in the osquery-go extension behavior and the shutdown request logged at extensions.cpp:220. Reproduce the SIGINT flow with the provided osqueryd command and determine whether the failed request is expected; done means confirming the behavior and identifying whether it should be avoided or documented.