P: (AI) Masking tools available at any stage of masking edits

Question

When I use the new AI masking tool to select Hair, Lips, and Eyes, I can only elect this option on a new photo with no mask. If I had a mask on a previously worked photo, I could not go back and use the new AI to select lips or hair. I have to delete the old, non-AI mask and then start again. The AI thumbnail pallet is no longer visible, and only adjustment sliders are visible in its place. Is this a bug or a current program limitation?
It would also be helpful to be able to use AI masking where two subjects exist, say, a person feeding a bird or operating an object in front of a background. Once I select a person, I cannot use AI to select the second object exclusively.
 
This is a valuable time saver and saves system resources. I don't want to arbitrarily have the AI mask everything, individually, in case I 'may' need it later. 
E
 
LRC 12
Mac OSX Monterey
Macmini 2018, 64gb Ram, 31" Screen.Alt: Ipad pro 2021 5th Get, 1tb storage/ram iOS Pad 15, Lightroom Mobile V8

JohanElzenga · Accepted Answer

No, I didn't see the Lightning icon. I'm working with new photos shot last Friday, but upgraded to LR12 on Sunday-Monday. So perhaps the process version hasn't changed. Having said that, do you have access to the AI masks after making at least one generic mask?

By @Ecphotographer

Yes, I do. I can create a linear gradient first, and then add a sky mask. Or brush a bit and then add the new people masks. Or any other combination.

JohanElzenga · Answer

Check if the image is perhaps in an older Process Version. If it is, you will see a small lightning icon on the right below the histogram. Click on it to let Lightroom update the version.

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