Vivat least vaguest.
Join Date: May 2016
They are an overly snug fit to begin with. Corrosion shrinks the sensor hole's bore and places a super fine coil under massive compression. Even a slight disturbance can then break continuity. While you could say that literally the garage did cause the fault, probably anyone who attempted the task woukd have experienced this outcome. Consider it a partial cost of the wheel bearing repair.
Drill out the dead sensor, hone the hole to a smooth sliding fit with a new sensor, install with a little marine grade grease coating the sensor sides and bore.