Does the "Find My Phone feature - During an activity, use GPS to navigate to the point where a phone lost connection." work for you?
I've tried turning off phone BT during activity and nothing happened.
In the evening, I finally got it to work by turning off BT (I ran there and on the same route back turned it off), but the location of the cell phone loss differed from reality by over 1km! So not great. I couldn't actually find the lost mobile that way.
This is briefly described in video Garmin Q2 2024 Software Update! youtu.be/9XbKQIR7dlY