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Jamie Pine
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transformers 4.57.x's `PreTrainedTokenizerBase._patch_mistral_regex` calls `huggingface_hub.model_info(repo_id)` unconditionally during any non-local tokenizer load to probe for Mistral-family models. The call raises on `HF_HUB_OFFLINE=1`, on network outages, and on slow/blocked HF endpoints, and transformers doesn't catch any of it — the exception bubbles out of `from_pretrained` and kills the load for unrelated engines (Qwen TTS, Qwen CustomVoice, TADA, etc.). 0.4.2's load-time `force_offline_if_cached` guard walked straight into this trap: on cached online users it flipped `HF_HUB_OFFLINE=1` and converted a healthy load into a hard crash. 0.4.3's inference-path guard masked it; #524 removed the inference guard in 0.4.4, and users updating to 0.4.4 started hitting the same error on the load path instead (#526). Fix: - Wrap `_patch_mistral_regex` so any exception from the inner HF metadata check is swallowed and the tokenizer is returned unchanged. Voicebox never loads Mistral models, so the regex rewrite this check gates is a no-op for us; matches the success-path behavior for non-Mistral repos (tokenization_utils_base.py:2503). - Drop the `force_offline_if_cached` wraps from every load path (pytorch_backend Qwen + Whisper, qwen_custom_voice_backend, mlx_backend Qwen + Whisper). With the mistral patch in place they provide zero value and only risk re-introducing the same class of bug. Helper and its unit tests stay — still correct for targeted future use. - Add `backend/tests/test_offline_patch.py` covering OfflineModeIsEnabled / ConnectionError suppression, success pass-through, idempotence, and the missing-method no-op path. Fixes #526.