I have found that, after applying a control line and setting its selectivity, if I then try to add a secondary control line, the image being edited doesn’t update to reflect the selectivity, until I move and replace one of the selectivity sliders.
Here is the mask after applying the primary control line, placing the pipette on the sky…
… and setting the selectivity thus…
Now I add a secondary control line and place the pipette to mask the water on the left…
This doesn’t appear to select only the water, which is of similar tone to the sky. But if I move the selectivity slider to a different value and then replace it at the original value…
… now the mask is updated correctly.
Can anyone else replicate this and would @sgospodarenko like to flag this?