Most log conversion LUTs assume the color space and transfer function are Rec. 709 since that is what they put in the file they write. Therefore, it would be nice to be able to apply a camera LUT before converting to a working linear.
For the next release we have added a feature to add a LUT to a clip directly - not as a filter. This applies the lut before any colorspace conversion and would provide the expected results in this case.