You’re not required to do their job for them, so just entering the password when they ask you to and don’t mention that there are multiple partitions in there a

You’re not required to do their job for them, so just entering the password when they ask you to and don’t mention that there are multiple partitions in there and you’re good to go. If they look carefully and notice the other partition (which you’re not even hiding) you’re back to the original problem of course.