I had the habit of using Top Left for zero and therefore assumed the BitZero v2 was broken as the probe goes north of the hole for the Z and then misses the surface altogether.
Slightly odd that this isn’t mentioned anywhere (is it?!) but anyway it works fine if you use Bottom Left location since north is over the flat part of the device.
I recently upgraded to the latest cm and the configuration has BitZero V1 listed first. Did you update your config? Also BitZero V2 has a minumn cm version are you at that version?