There are effectively two freewheels or freehubs on a mid drive ebike, a normal one attached to the rear wheel hub, and one in the motor which allows the cranks to spin backwards without moving the chainring. The clunky feel is is most obvious when both freehubs are active (when the bike is coasting and cranks are back pedalling) and you pedal forwards which causes the pawls to engage in both freehubs, albeit at slightly different offsets. What is hardly noticeable on a normal bike is very obvious on these bikes. As a mtber whose bikes all have 54 or 120pt engagement freehubs I found this slop really annoying until I stopped thinking about it... luckily it doesn’t really matter on a commuter bike.