Hello guys, on custom tool Api request when I click test, I always get Request Body: {} and the banner “No variables detected in URL, headers, or body schema.” I can’t type in the body. I tried Visual and JSON builder, refresh/incognito, re-save, and even recreating the tool. Same result. My n8n webhook works if I send a real payload (or query params), but I can’t test from the Vapi UI. Is this a known bug? How can I make the Test modal detect variables from the body schema