You don’t have to have a full rest period every other weekend, you have to have a full rest period every other fixed week. It’s not the same thing.
Week 1- you have a full rest which straddles 00:00 Monday at the beginning of the fixed week.
Week 3- you have a full rest which straddles 00:00 Monday at the end of the fixed week.
Therefore in week 2 you can have a reduced rest at both the beginning and end of the fixed week.