Noticed this while testing 3.6.9 on Mac OSX Mojave connected to Taz Pro. To reproduce:
Connect to printer, click "Home All" button in monitor screen,
From Monitor screen, Select Extruder 1.. once Extruder 1 is in down position, select Extruder 2
Once you select extruder 2, the nozzles switch and the entire tool head rams into the left end of X axis.