I was doing manual leveling and follow it with active leveling once a time every month, mostly.   No matter how i manual level the nozzles, whenever active leveling is done, the printer will always press nozzle 2 too close to buildplate once print is started.  I can see the nozzle was so close that it got pushed back a bit upwards, so close that filament cannot print out of it.   Core 1 will always be fine and well calibrated, while Core 2 will always be too close to bed