A few-step H3 file whose metadata keeps explicit head sizes but not the head count was built with one head and failed on the head biases. The count is now taken from the head bias and patch projection shapes (shapes only, any device or dtype), with a test through the real loader at every weight dtype. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Tw9fjUsYDkyEtLCrzqv7jo