Entity Framework generates a second left join in a one-to-one (optional/required) relationship?

First welcome to the exciting world(!) of entity framework which is full of surprises. I have faced with this situation before; when you have one to one relationships, even if you do not explicitly include the related entity, entity framework creates a join statement. In your case, first join results from the include statement and the other left outer join is added by default.

You can check this by removing include statement and observing the sql output which will include the left outer join statement.

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