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Gemma 4 31B QAT GGUF loads with MTP branch, but outputs repeated <unused49> - any working recipe?

I’m trying to run: unsloth/gemma-4-31B-it-qat-GGUF gemma-4-31B-it-qat-UD-Q4_K_XL.gguf on an RTX 5090 32GB using llama.cpp Gemma 4 MTP PR branch. Main model loads. Without the MTP assistant head, /v1/chat/completions retu

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