Thanks for sharing this. We are suggesting below steps to better troubleshoot the issue.

1. Use the HomeGraph Viewer tool to confirm that the state of the gate is correctly updated after the gate is closed. Ensure that the correct state is reflected in the HomeGraph before the test queries it again. This will help you determine if the problem is with the state update or the timing of the query.
2. In your case, the test is querying the state too soon after closing the gate. Increasing the timeout between the state change and the query could allow enough time for the state to propagate through your system and reach Google’s HomeGraph. Try increasing the Report State timeout within Test Suite beyond 20 seconds to give the system more time to process the change.

Let us know how it goes.