I just checked that model (ISTA-DASLab/Qwen3.8-27B-GSQ-RCO-GGUF:IQ3_S) and it does much much worse on the "Please recite Jabberwocky" test than the original bf16 does.
The bf16 only misses "snicker-snack" and this quantization becomes confused after the first stanza.
The bf16 only misses "snicker-snack" and this quantization becomes confused after the first stanza.