Does ‘preserve_thinking’ work with openwebui?

I'm running qwen3.6-35b with llama.cpp connected to openwebui. And I noticed the model fails the number guessing game test on openwebui while it works perfectly with the llama.cpp web ui. Am I missing something and need to activate it somewhere?

Otherwise I guess I'll open an Issue on GH or create a PR.

Thanks a lot! 😄