Actually MB has made it so that the chain can not get over a tooth at most crank gears. There is a ridge on the pan that is just the right distance to prevent that. Besides, it doesn't matter on gas motors, if you use proper line-up technique, where the chain is.
The only reason not to drop the chain is that it is sometimes hard to get it all back up. it can hang on things.
Bosch Master, ASE Master, L1
33 years MB technician