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The setup shader statically uses the fltmap binding, but the decoder only bound a buffer to it for float formats, leaving a dangling descriptor on everything else, with the write reachable by any bitstream signalling remap. Gate remap on a new push-constant flag, so that streams signalling it without a fltmap buffer error out, and point the descriptor at the slice feedback buffer when no fltmap exists; the gate guarantees it is never written through this binding.