Google Calendar Check Availability tool issue

Google calendar check availabilty tool is not working. I'm talking about the built in VAPI tool.
When a slot is booked at a given time , it still says in the assistant that the slot is available. I have cross checked the time zones. Has anyone faced this issue before ? I have attached screenshots for reference. Any response will be very appreciated.

The calendar ID is inputted properly as well
Screenshot_2025-08-07_at_3.14.32_AM.png
Screenshot_2025-08-07_at_3.14.44_AM.png
Screenshot_2025-08-07_at_3.14.53_AM.png
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