This conversation has been merged. Please reference the main conversation: Lightroom/Camera Raw: Disable built-in lens profile
Per request from Sony, Lightroom will enable the external lens profile automatically for raw files if the lens comp settings are enabled in the camera and an external profile is available in the version of the application you are running. The external profile corrects for geometric distortion and vignetting only. The chromatic aberration correction is baked into the raw file using opcodes that cannot be disabled in Lightroom.
If you wish to disable the external profile by default, you can set a new lens profile default (with it disabled) for each lens/camera combination.
Note: This conversation was created from a reply on: Lightroom: Unable to disable "Built-in Lens Profile applied" for raw files.