The unexpected behavior with Helicone and streaming responses

I can't figure out why Helicone invents different response than what I am logging when stream=true. I verify that I log a simple object with id and completion properties and yet in Helicone I get completely different one. Why??

This is limiting me from releasing the new feature and I must admit it's pretty frustrating. Request is logged all good. I use async logging and pass this object to providerResponse.json. It's been working for everything else.

It also works if I omit stream:true property. I cannot use gateway since it's my own inference server hosted on IP address (no domain).

What can be done about this rather unexpected behaviour?

For context: I'm using Vercel AI to stream response to the frontend and thus I don't have access to the direct streaming response - only the full string upon completion.