[r/LocalLLaMA] How to fix prompt reprocessing in qwen3.5 models (instruct mode only)

Summary

A user discovered and identified a bug in Qwen 3.5 models running in llama.cpp's instruct mode (thinking disabled), where the model reprocesses the last message on every turn. The issue stems from the default Jinja chat template injecting an empty 'think' block, preventing the model from picking up correctly. This fix addresses the prompt reprocessing behavior for this specific configuration.

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