Variants: Single
Scenarios:

As an administrator with a 3.6 mongod instance and FCV 3.4,
When I uncleanly shutdown the instance and start under the 3.4 binary,
then the instance does not start successfully.

As an administrator with a 3.6 mongod instance and FCV 3.4 and has attempted an unclean downgrade to 3.4,
When I start the instance against a 3.6 binary,
then the instance starts successfully.