I also have encountered these very issues and have found a solution that worked for me.
I believe this happens when motion is detected outside the light group you are triggering. For instance if I wanted to turn on my front yard lights when walking in by my backyard spotlight cam these become linked devices and will only trigger a 1 minute timer for the front yard lights. The auto timer will work for the spotlight cam that was trigger in its group but the front will cycle off after a minute. No matter what auto timer is set to in either group. Now say if you trigger the motion from a backyard spotlight cam and it will trigger the remaining lights in its group and they will all follow the auto timer you have set for that group. Only solution I found is too group all light that you want to trigger with motion must be in same group. So if you wanted backyard light to trigger front or vice versa then you would need this devices in a outside light group. Or if you wanted lights on side of house to trigger front then all of the lights need to be in a single grouping. I believe this happens because there is no setting for changing linked device timers. Auto shut off is a group timer.
Alternatively linked devices such as doorbells will only trigger the 60 sec timer because they are not part of the light group and are only linked to the lights through bridge. All motion must be trigger in same group with a bridged device to trigger the auto shut off function.
I could be totally off base here but these are just my assumptions and with trial and error this has worked for me.
Again to use the auto timer function all lights and motion detection must happen within its own group to trigger the auto shutoff feature and it must be from a device that is directly controlled by the smart light bridge such as A ring motion sensor, step light, spot light cam, etc…