Filtering An API Call By 'UsedRuntimes' Returns Unexpected Error

Why is it not possible to filter API call response by the 'UsedRuntimes' field while all other filters seem to be working fine?

Issue Description: While making certain API calls and filtering them with the 'UsedRuntimes' field, the following error response is returned.

Root Cause: The Busy status is not shown for Unattended Sessions by design (w.r.t the UI). Filtering / sorting by 'UsedRuntimes' is not supported, leading to the above error in the API call while filtering with 'UsedRuntimes'.