Vapi Function Tools giving error "No Result Returned" even after receiving webhook response

Call ID: 2432077b-6a9e-4d00-921e-ae046b1ec986
Timestamp: 1757057585308
Response I expected: I expected the assistant to use the tool call response correctly.
Response I go: Error that no response received.

Webhook created on Make.com . Details attached.

Earlier, I create a server with 13 tools, which were not working. So I tried a very simple tool that returns a plain string. But this is also not working. Webhook is sending correct response in correct format but the tool call response in Vapi Call Logs says "No Result Returned".
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