Hi, we can never guarantee that the negating of the LUT effect will be possible. This is because negating a LUT is not as simple as "reverting" some values, which is the case of some other operators like exposure.
This is a limitation we may never be able to overcome, and it is even stated in the TonemapControl node UI (see screenshot).
Could you explain what exactly you are doing? What kind of workflow are you applying that you need to enable a LUT in the VFB and remove the same LUT via the TonemapControl node?
Maybe we could help with some workaround.