Qwen3.5 prompt and role-playing

So, I have downloaded Qwen3.5 and tried it with SillyTavern and my tabletop-RPG prompt. If I use text completion, which is my favourite way, there is no problem. But then I tried it with Marinara's Spaghetti preset, which is for the chat completion API. For people with no SillyTavern experience, it's an API that sends message formatted for openAI API, and llama.cpp s it. Well, the API refuses payload with than one message labeled as "system". This is not the end of the world because you can just squash every system message at the beginning of the chat and eliminate the ones appearing later.