I think there are two issues.

The first one is that I expect the Address entity to be loaded lazily.
My expectation is fulfilled at sql query level, only the id of Address is loaded in:

select
        customer0_.ID as col_0_0_,
        customer0_.FK6_FOR_CUSTOMER_TABLE as col_1_0_ 
    from
        CUSTOMER_TABLE customer0_ 
    inner join
        ADDRESS address1_ 
            on customer0_.FK6_FOR_CUSTOMER_TABLE=address1_.ID 
    where
        customer0_.ID=?

I would expect the join to be created only if I pass an EntityGraph referring address or if I declare the relation as EAGER.
So there is clearly no need to left join or inner join on address, isn't it?

The second one is that if a join is made, it should be at least a left join since the relation of customer to address is optional.